Tcl Source Code

.TH expr n 8.5 Tcl "Tcl Built-In Commands"
.so man.macros
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
expr \- Evaluate an expression
.SH SYNOPSIS
\fBexpr \fIexpression\fR
.BE
.SH DESCRIPTION
.PP

Evaluates the expression, \fIexpression\fR, returning its value.
The operators permitted in an expression include a subset of
the operators permitted in C expressions.  For those operators
common to both Tcl and C, Tcl applies the same meaning and precedence
as the corresponding C operators.
The value of an expression is often a numeric result, either an integer or a
floating-point value, but may also be a non-numeric value.
For example, the expression
.PP
.CS
\fBexpr\fR {8.2 + 6}
.CE
.PP
evaluates to 14.2.
Expressions differ from C expressions in the way that
operands are specified.  Expressions also support
non-numeric operands, string comparisons, and some
additional operators not found in C.
.PP
When the result of expression is an integer, it is in decimal form, and when
the result is a floating-point number, it is in the form produced by the
\fB%g\fR format specifier of \fBformat\fR.
.PP
.VS "9.0, TIP 526"
Unlike with prior versions of Tcl, from Tcl 9.0 onwards, the \fBexpr\fR
command only accepts a single argument instead of concatenating an arbitrary
number of arguments to form an expression.
See \fBCOMPATIBILITY WITH TCL 8.*\fR below for details.
.VE "9.0, TIP 526"
.VS "TIP 582"
At any point in the expression except within double quotes or braces, \fB#\fR
is the beginning of a comment, which lasts to the end of the line or
the end of the expression, whichever comes first.
.VE "TIP 582"
.SS OPERANDS
.PP

\fBexpr\fR {$v?[a]:[b]}
.CE
.PP
only one of \fB[a]\fR or \fB[b]\fR is evaluated,
depending on the value of \fB$v\fR.  This is not true of the normal Tcl parser,
so it is normally recommended to enclose the arguments to \fBexpr\fR in braces.
Without braces, as in
\fBexpr\fR $v?[a]:[b]
both \fB[a]\fR and \fB[b]\fR are evaluated before \fBexpr\fR is even called.
.PP
For more details on the results
produced by each operator, see the documentation for C.
.SS "MATH FUNCTIONS"
.PP
A mathematical function such as \fBsin($x)\fR is replaced with a call to an ordinary

.CE
.PP
both return 1.25.
A floating-point result can be distinguished from an integer result by the
presence of either
.QW \fB.\fR
or
.QW \fBe\fR .
.PP
For example,
.PP
.CS
\fBexpr\fR {20.0/5.0}
.CE
.PP
returns \fB4.0\fR, not \fB4\fR.
.SH "PERFORMANCE AND COMPATIBILITY"
.PP
Where an expression contains syntax that Tcl would otherwise perform
substitutions on, enclosing an expression in braces or otherwise quoting it
so that it's a static value allows the Tcl compiler to generate bytecode for
the expression, resulting in better speed and smaller storage requirements.
This also avoids issues that can arise if Tcl is allowed to perform
substitution on the value before \fBexpr\fR is called.
.PP
In the following example, the value of the expression is 11 because the Tcl parser first
substitutes \fB$b\fR and \fBexpr\fR then substitutes \fB$a\fR as part
of evaluating the expression
.QW "$a + 2*4" .
Simply enclosing the
expression in braces would result in a syntax error as \fB$b\fR does
not evaluate to a numeric value.
.PP
.CS
set a 3
set b {$a + 2}
\fBexpr\fR $b*4

Most expressions are not formed at runtime, but are literal strings or contain
substitutions that don't introduce other substitutions.  To allow the bytecode
compiler to work with an expression as a string literal at compilation time,
ensure that it contains no substitutions or that it is enclosed in braces or
otherwise quoted to prevent Tcl from performing substitutions, allowing
\fBexpr\fR to perform them instead.
.PP
In general, you should enclose your expression in braces wherever possible,
and where not possible, the argument to \fBexpr\fR should be an expression
defined elsewhere as simply as possible. It is usually more efficient and
safer to use other techniques (e.g., the commands in the \fBtcl::mathop\fR

namespace) than it is to do complex expression generation. Storing a
complex expression in a variable and using that with \fBexpr\fR is a
case which the bytecode compiler also supports well, provided that
expression is always evaluated in the same stack context (though the
expression could be conveyed across procedure calls and through
\fBuplevel\fR calls in between).
.SS "COMPATIBILITY WITH TCL 8.*"
.PP
.VS "9.0, TIP 526"
In Tcl 8 and older, the \fBexpr\fR command would concatenate multiple
arguments to form the expression; if this behavior is desired in Tcl 9.0
onwards, explicit use of \fBconcat\fR is required (this is also compatible
with earlier versions of Tcl) or a double-quoted argument could be used (as
whitespace is not generally important in expressions). Note that this style of
programming is often a source of bugs, including security bugs, so it is
\fInot recommended\fR. For example, instead of this version (supported in Tcl
8 and before):
.PP
.CS
set a 3
set b {$a + 2}
\fBexpr\fR $b * 4
.CE
.PP
you might write:
.PP
.CS
# ...
\fBexpr\fR [concat $b * 4]
.CE
.PP
or:
.PP
.CS
# ...
\fBexpr\fR "$b * 4"
.CE
.PP
Both of the above cases substitute \fB$b\fR prior to evaluating the
expression, and do the building of the expression dynamically making it
difficult to avoid compiling the expression on every call to \fBexpr\fR.
.PP
However, some use cases that \fIare\fR supported may be preferable, such as
embedding the use of \fBexpr\fR with a variable argument inside an otherwise
constant expression:
.PP
.CS
# ...
\fBexpr\fR {[\fBexpr\fR $b] * 4}
.CE
.PP
This changes what value is calculated (in this case, producing \fB20\fR rather
than \fB11\fR) because they force the inner expression to be evaluated
independently of the outer one; such changes may actually fix more bugs than
they cause! Note that this allows the outer expression to be fully compiled,


and enables compilation of the inner expression too (which can be cached in
some cases).
.VE "9.0, TIP 526"
.SH EXAMPLES
.PP
A numeric comparison whose result is 1:
.PP
.CS
\fBexpr\fR {"0x03" > "2"}
.CE

    TCL_UNUSED(void *),
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Obj *resultPtr, *objPtr;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "expression");
	return TCL_ERROR;
    }

    TclNewObj(resultPtr);
    Tcl_IncrRefCount(resultPtr);

    objPtr = objv[1];
    TclNRAddCallback(interp, ExprCallback, resultPtr, NULL, NULL, NULL);





    return Tcl_NRExprObj(interp, objPtr, resultPtr);
}

static int
ExprCallback(
    void *data[],
    Tcl_Interp *interp,
    int result)
{
    Tcl_Obj *resultPtr = (Tcl_Obj *)data[0];






    if (result == TCL_OK) {
	Tcl_SetObjResult(interp, resultPtr);
    }
    Tcl_DecrRefCount(resultPtr);
    return result;
}

    Tcl_Parse *parsePtr,	/* Points to a parse structure for the command
				 * created by Tcl_ParseCommand. */
    TCL_UNUSED(Command *),
    CompileEnv *envPtr)		/* Holds resulting instructions. */
{
    Tcl_Token *firstWordPtr;

    if (parsePtr->numWords != 2) {
	return TCL_ERROR;
    }

    /*
     * TIP #280: Use the per-word line information of the current command.
     */

# start of tests

catch {unset a b i x}

test compExpr-old-1.1 {TclCompileExprCmd: no expression} {
    list [catch {expr  } msg] $msg
} {1 {wrong # args: should be "expr expression"}}
test compExpr-old-1.2 {TclCompileExprCmd: one expression word} {
    expr -25
} -25





# 1.3 and 1.4 no longer apply
test compExpr-old-1.5 {TclCompileExprCmd: quoted expression word} {
    expr "0005"
} 5
test compExpr-old-1.6 {TclCompileExprCmd: quoted expression word} {
    catch {expr "0005"zxy} msg
    set msg
} {extra characters after close-quote}

test compExpr-old-1.13 {TclCompileExprCmd: second level of substitutions in expr not in braces with single var reference} {
    set a xxx
    set x 27;  set bool {$x};  if $bool {set a foo}
    set a
} foo
test compExpr-old-1.14 {TclCompileExprCmd: second level of substitutions in expr with comparison as top-level operator} {
    set a xxx
    set x 2;  set b {$x};  set a [expr $b==2]
    set a
} 1

test compExpr-old-2.1 {TclCompileExpr: are builtin functions registered?} {
    expr double(5*[llength "6 2"])
} 10.0
test compExpr-old-2.2 {TclCompileExpr: error in expr} -body {

	}
    }
}
testConstraint ieeeFloatingPoint [testIEEE]

# First, test all of the integer operators individually.

test expr-old-1.1 {integer operators} {expr {-4}} -4
test expr-old-1.2 {integer operators} {expr {-(1 + 4)}} -5
test expr-old-1.3 {integer operators} {expr {~3}} -4
test expr-old-1.4 {integer operators} {expr {!2}} 0
test expr-old-1.5 {integer operators} {expr {!0}} 1
test expr-old-1.6 {integer operators} {expr {4 * 6}} 24
test expr-old-1.7 {integer operators} {expr {36 / 12}} 3
test expr-old-1.8 {integer operators} {expr {27 / 4}} 6
test expr-old-1.9 {integer operators} {expr {27 % 4}} 3
test expr-old-1.10 {integer operators} {expr {2 + 2}} 4
test expr-old-1.11 {integer operators} {expr {2 - 6}} -4
test expr-old-1.12 {integer operators} {expr {1 << 3}} 8
test expr-old-1.13 {integer operators} {expr {0xff >> 2}} 63
test expr-old-1.14 {integer operators} {expr {-1 >> 2}} -1
test expr-old-1.15 {integer operators} {expr {3 > 2}} 1
test expr-old-1.16 {integer operators} {expr {2 > 2}} 0
test expr-old-1.17 {integer operators} {expr {1 > 2}} 0
test expr-old-1.18 {integer operators} {expr {3 < 2}} 0
test expr-old-1.19 {integer operators} {expr {2 < 2}} 0
test expr-old-1.20 {integer operators} {expr {1 < 2}} 1
test expr-old-1.21 {integer operators} {expr {3 >= 2}} 1
test expr-old-1.22 {integer operators} {expr {2 >= 2}} 1
test expr-old-1.23 {integer operators} {expr {1 >= 2}} 0
test expr-old-1.24 {integer operators} {expr {3 <= 2}} 0
test expr-old-1.25 {integer operators} {expr {2 <= 2}} 1
test expr-old-1.26 {integer operators} {expr {1 <= 2}} 1
test expr-old-1.27 {integer operators} {expr {3 == 2}} 0
test expr-old-1.28 {integer operators} {expr {2 == 2}} 1
test expr-old-1.29 {integer operators} {expr {3 != 2}} 1
test expr-old-1.30 {integer operators} {expr {2 != 2}} 0
test expr-old-1.31 {integer operators} {expr {7 & 0x13}} 3
test expr-old-1.32 {integer operators} {expr {7 ^ 0x13}} 20
test expr-old-1.33 {integer operators} {expr {7 | 0x13}} 23
test expr-old-1.34 {integer operators} {expr {0 && 1}} 0
test expr-old-1.35 {integer operators} {expr {0 && 0}} 0
test expr-old-1.36 {integer operators} {expr {1 && 3}} 1
test expr-old-1.37 {integer operators} {expr {0 || 1}} 1
test expr-old-1.38 {integer operators} {expr {3 || 0}} 1
test expr-old-1.39 {integer operators} {expr {0 || 0}} 0
test expr-old-1.40 {integer operators} {expr {3>2 ? 44 : 66}} 44
test expr-old-1.41 {integer operators} {expr {2>3 ? 44 : 66}} 66
test expr-old-1.42 {integer operators} {expr {36 / 5}} 7
test expr-old-1.43 {integer operators} {expr {36 % 5}} 1
test expr-old-1.44 {integer operators} {expr {-36 / 5}} -8
test expr-old-1.45 {integer operators} {expr {-36 % 5}} 4
test expr-old-1.46 {integer operators} {expr {36 / -5}} -8
test expr-old-1.47 {integer operators} {expr {36 % -5}} -4
test expr-old-1.48 {integer operators} {expr {-36 / -5}} 7
test expr-old-1.49 {integer operators} {expr {-36 % -5}} -1
test expr-old-1.50 {integer operators} {expr {+36}} 36
test expr-old-1.51 {integer operators} {expr {+--++36}} 36
test expr-old-1.52 {integer operators} {expr {+36%+5}} 1
test expr-old-1.53 {integer operators} -setup {
    unset -nocomplain x
} -body {
    set x yes
    list [expr {1 && $x}] [expr {$x && 1}] \
         [expr {0 || $x}] [expr {$x || 0}]
} -result {1 1 1 1}

# Check the floating-point operators individually, along with
# automatic conversion to integers where needed.

test expr-old-2.1 {floating-point operators} {expr {-4.2}} -4.2
test expr-old-2.2 {floating-point operators} {expr {-(1.125 + 4.25)}} -5.375
test expr-old-2.3 {floating-point operators} {expr {+5.7}} 5.7
test expr-old-2.4 {floating-point operators} {expr {+--+-62.0}} -62.0
test expr-old-2.5 {floating-point operators} {expr {!2.1}} 0
test expr-old-2.6 {floating-point operators} {expr {!0.0}} 1
test expr-old-2.7 {floating-point operators} {expr {4.2 * 6.3}} 26.46
test expr-old-2.8 {floating-point operators} {expr {36.0 / 12.0}} 3.0
test expr-old-2.9 {floating-point operators} {expr {27 / 4.0}} 6.75
test expr-old-2.10 {floating-point operators} {expr {2.3 + 2.1}} 4.4
test expr-old-2.11 {floating-point operators} {expr {2.3 - 6.5}} -4.2
test expr-old-2.12 {floating-point operators} {expr {3.1 > 2.1}} 1
test expr-old-2.13 {floating-point operators} {expr {2.1 > 2.1}} 0
test expr-old-2.14 {floating-point operators} {expr {1.23 > 2.34e+1}} 0
test expr-old-2.15 {floating-point operators} {expr {3.45 < 2.34}} 0
test expr-old-2.16 {floating-point operators} {expr {0.002e3<--200e-2}} 0
test expr-old-2.17 {floating-point operators} {expr {1.1 < 2.1}} 1
test expr-old-2.18 {floating-point operators} {expr {3.1 >= 2.2}} 1
test expr-old-2.19 {floating-point operators} {expr {2.345 >= 2.345}} 1
test expr-old-2.20 {floating-point operators} {expr {1.1 >= 2.2}} 0
test expr-old-2.21 {floating-point operators} {expr {3.0 <= 2.0}} 0
test expr-old-2.22 {floating-point operators} {expr {2.2 <= 2.2}} 1
test expr-old-2.23 {floating-point operators} {expr {2.2 <= 2.2001}} 1
test expr-old-2.24 {floating-point operators} {expr {3.2 == 2.2}} 0
test expr-old-2.25 {floating-point operators} {expr {2.2 == 2.2}} 1
test expr-old-2.26 {floating-point operators} {expr {3.2 != 2.2}} 1
test expr-old-2.27 {floating-point operators} {expr {2.2 != 2.2}} 0
test expr-old-2.28 {floating-point operators} {expr {0.0 && 0.0}} 0
test expr-old-2.29 {floating-point operators} {expr {0.0 && 1.3}} 0
test expr-old-2.30 {floating-point operators} {expr {1.3 && 0.0}} 0
test expr-old-2.31 {floating-point operators} {expr {1.3 && 3.3}} 1
test expr-old-2.32 {floating-point operators} {expr {0.0 || 0.0}} 0
test expr-old-2.33 {floating-point operators} {expr {0.0 || 1.3}} 1
test expr-old-2.34 {floating-point operators} {expr {1.3 || 0.0}} 1
test expr-old-2.35 {floating-point operators} {expr {3.3 || 0.0}} 1
test expr-old-2.36 {floating-point operators} {expr {3.3>2.3 ? 44.3 : 66.3}} 44.3
test expr-old-2.37 {floating-point operators} {expr {2.3>3.3 ? 44.3 : 66.3}} 66.3
test expr-old-2.38 {floating-point operators} {
    list [catch {expr {028.1 + 09.2}} msg] $msg
} {0 37.3}

# Operators that aren't legal on floating-point numbers

test expr-old-3.1 {illegal floating-point operations} -returnCodes error -body {
    expr {~4.0}
} -result {can't use floating-point value "4.0" as operand of "~"}
test expr-old-3.2 {illegal floating-point operations} -returnCodes error -body {
    expr {27 % 4.0}
} -result {can't use floating-point value "4.0" as operand of "%"}
test expr-old-3.3 {illegal floating-point operations} -returnCodes error -body {
    expr {27.0 % 4}
} -result {can't use floating-point value "27.0" as operand of "%"}
test expr-old-3.4 {illegal floating-point operations} -returnCodes error -body {
    expr {1.0 << 3}
} -result {can't use floating-point value "1.0" as operand of "<<"}
test expr-old-3.5 {illegal floating-point operations} -returnCodes error -body {
    expr {3 << 1.0}
} -result {can't use floating-point value "1.0" as operand of "<<"}
test expr-old-3.6 {illegal floating-point operations} -returnCodes error -body {
    expr {24.0 >> 3}
} -result {can't use floating-point value "24.0" as operand of ">>"}
test expr-old-3.7 {illegal floating-point operations} -returnCodes error -body {
    expr {24 >> 3.0}
} -result {can't use floating-point value "3.0" as operand of ">>"}
test expr-old-3.8 {illegal floating-point operations} -returnCodes error -body {
    expr {24 & 3.0}
} -result {can't use floating-point value "3.0" as operand of "&"}
test expr-old-3.9 {illegal floating-point operations} -returnCodes error -body {
    expr {24.0 | 3}
} -result {can't use floating-point value "24.0" as operand of "|"}
test expr-old-3.10 {illegal floating-point operations} -returnCodes error -body {
    expr {24.0 ^ 3}
} -result {can't use floating-point value "24.0" as operand of "^"}

# Check the string operators individually.

test expr-old-4.1 {string operators} {expr {"abc" > "def"}} 0
test expr-old-4.2 {string operators} {expr {"def" > "def"}} 0
test expr-old-4.3 {string operators} {expr {"g" > "def"}} 1
test expr-old-4.4 {string operators} {expr {"abc" < "abd"}} 1

test expr-old-4.29 {string operators} {expr {"0" == "+"}} 0
test expr-old-4.30 {string operators} {expr {"0" == "-"}} 0
test expr-old-4.31 {string operators} {expr {1?"foo":"bar"}} foo
test expr-old-4.32 {string operators} {expr {0?"foo":"bar"}} bar

# Operators that aren't legal on string operands.

test expr-old-5.1 {illegal string operations} -returnCodes error -body {
    expr {-"a"}
} -result {can't use non-numeric string "a" as operand of "-"}
test expr-old-5.2 {illegal string operations} -returnCodes error -body {
    expr {+"a"}
} -result {can't use non-numeric string "a" as operand of "+"}
test expr-old-5.3 {illegal string operations} -returnCodes error -body {
    expr {~"a"}
} -result {can't use non-numeric string "a" as operand of "~"}
test expr-old-5.4 {illegal string operations} -returnCodes error -body {
    expr {!"a"}
} -result {can't use non-numeric string "a" as operand of "!"}
test expr-old-5.5 {illegal string operations} -returnCodes error -body {
    expr {"a" * "b"}
} -result {can't use non-numeric string "a" as operand of "*"}
test expr-old-5.6 {illegal string operations} -returnCodes error -body {
    expr {"a" / "b"}
} -result {can't use non-numeric string "a" as operand of "/"}
test expr-old-5.7 {illegal string operations} -returnCodes error -body {
    expr {"a" % "b"}
} -result {can't use non-numeric string "a" as operand of "%"}
test expr-old-5.8 {illegal string operations} -returnCodes error -body {
    expr {"a" + "b"}
} -result {can't use non-numeric string "a" as operand of "+"}
test expr-old-5.9 {illegal string operations} -returnCodes error -body {
    expr {"a" - "b"}
} -result {can't use non-numeric string "a" as operand of "-"}
test expr-old-5.10 {illegal string operations} -returnCodes error -body {
    expr {"a" << "b"}
} -result {can't use non-numeric string "a" as operand of "<<"}
test expr-old-5.11 {illegal string operations} -returnCodes error -body {
    expr {"a" >> "b"}
} -result {can't use non-numeric string "a" as operand of ">>"}
test expr-old-5.12 {illegal string operations} -returnCodes error -body {
    expr {"a" & "b"}
} -result {can't use non-numeric string "a" as operand of "&"}
test expr-old-5.13 {illegal string operations} -returnCodes error -body {
    expr {"a" ^ "b"}
} -result {can't use non-numeric string "a" as operand of "^"}
test expr-old-5.14 {illegal string operations} -returnCodes error -body {
    expr {"a" | "b"}
} -result {can't use non-numeric string "a" as operand of "|"}
test expr-old-5.15 {illegal string operations} -returnCodes error -body {
    expr {"a" && "b"}
} -result {expected boolean value but got "a"}
test expr-old-5.16 {illegal string operations} -returnCodes error -body {
    expr {"a" || "b"}
} -result {expected boolean value but got "a"}
test expr-old-5.17 {illegal string operations} -returnCodes error -body {
    expr {"a" ? 4 : 2}
} -result {expected boolean value but got "a"}

# Check precedence pairwise.

test expr-old-6.1 {precedence checks} {expr {-~3}} 4
test expr-old-6.2 {precedence checks} {expr {-!3}} 0
test expr-old-6.3 {precedence checks} {expr {-~0}} 1

test expr-old-7.1 {precedence checks} {expr {2 * 4 / 6}} 1
test expr-old-7.2 {precedence checks} {expr {24 / 6 * 3}} 12
test expr-old-7.3 {precedence checks} {expr {24 / 6 / 2}} 2

test expr-old-8.1 {precedence checks} {expr {-2+4}} 2
test expr-old-8.2 {precedence checks} {expr {-2-4}} -6
test expr-old-8.3 {precedence checks} {expr {+2-4}} -2

test expr-old-9.1 {precedence checks} {expr {2*3+4}} 10
test expr-old-9.2 {precedence checks} {expr {8/2+4}} 8
test expr-old-9.3 {precedence checks} {expr {8%3+4}} 6
test expr-old-9.4 {precedence checks} {expr {2*3-1}} 5
test expr-old-9.5 {precedence checks} {expr {8/2-1}} 3
test expr-old-9.6 {precedence checks} {expr {8%3-1}} 1

test expr-old-10.1 {precedence checks} {expr {6-3-2}} 1

test expr-old-11.1 {precedence checks} {expr {7+1>>2}} 2
test expr-old-11.2 {precedence checks} {expr {7+1<<2}} 32
test expr-old-11.3 {precedence checks} {expr {7>>3-2}} 3
test expr-old-11.4 {precedence checks} {expr {7<<3-2}} 14

test expr-old-12.1 {precedence checks} {expr {6>>1>4}} 0
test expr-old-12.2 {precedence checks} {expr {6>>1<2}} 0
test expr-old-12.3 {precedence checks} {expr {6>>1>=3}} 1
test expr-old-12.4 {precedence checks} {expr {6>>1<=2}} 0
test expr-old-12.5 {precedence checks} {expr {6<<1>5}} 1
test expr-old-12.6 {precedence checks} {expr {6<<1<5}} 0
test expr-old-12.7 {precedence checks} {expr {5<=6<<1}} 1
test expr-old-12.8 {precedence checks} {expr {5>=6<<1}} 0

test expr-old-13.1 {precedence checks} {expr {2<3<4}} 1
test expr-old-13.2 {precedence checks} {expr {0<4>2}} 0
test expr-old-13.3 {precedence checks} {expr {4>2<1}} 0
test expr-old-13.4 {precedence checks} {expr {4>3>2}} 0
test expr-old-13.5 {precedence checks} {expr {4>3>=2}} 0
test expr-old-13.6 {precedence checks} {expr {4>=3>2}} 0
test expr-old-13.7 {precedence checks} {expr {4>=3>=2}} 0
test expr-old-13.8 {precedence checks} {expr {0<=4>=2}} 0
test expr-old-13.9 {precedence checks} {expr {4>=2<=0}} 0
test expr-old-13.10 {precedence checks} {expr {2<=3<=4}} 1

test expr-old-14.1 {precedence checks} {expr {1==4>3}} 1
test expr-old-14.2 {precedence checks} {expr {0!=4>3}} 1
test expr-old-14.3 {precedence checks} {expr {1==3<4}} 1
test expr-old-14.4 {precedence checks} {expr {0!=3<4}} 1
test expr-old-14.5 {precedence checks} {expr {1==4>=3}} 1
test expr-old-14.6 {precedence checks} {expr {0!=4>=3}} 1
test expr-old-14.7 {precedence checks} {expr {1==3<=4}} 1
test expr-old-14.8 {precedence checks} {expr {0!=3<=4}} 1
test expr-old-14.9 {precedence checks} {expr {1eq4>3}} 1
test expr-old-14.10 {precedence checks} {expr {0ne4>3}} 1
test expr-old-14.11 {precedence checks} {expr {1eq3<4}} 1
test expr-old-14.12 {precedence checks} {expr {0ne3<4}} 1
test expr-old-14.13 {precedence checks} {expr {1eq4>=3}} 1
test expr-old-14.14 {precedence checks} {expr {0ne4>=3}} 1
test expr-old-14.15 {precedence checks} {expr {1eq3<=4}} 1
test expr-old-14.16 {precedence checks} {expr {0ne3<=4}} 1

test expr-old-15.1 {precedence checks} {expr {1==3==3}} 0
test expr-old-15.2 {precedence checks} {expr {3==3!=2}} 1
test expr-old-15.3 {precedence checks} {expr {2!=3==3}} 0
test expr-old-15.4 {precedence checks} {expr {2!=1!=1}} 0
test expr-old-15.5 {precedence checks} {expr {1eq3eq3}} 0
test expr-old-15.6 {precedence checks} {expr {3eq3ne2}} 1
test expr-old-15.7 {precedence checks} {expr {2ne3eq3}} 0
test expr-old-15.8 {precedence checks} {expr {2ne1ne1}} 0

test expr-old-16.1 {precedence checks} {expr {2&3eq2}} 0
test expr-old-16.2 {precedence checks} {expr {1&3ne3}} 0
test expr-old-16.3 {precedence checks} {expr {2&3eq2}} 0
test expr-old-16.4 {precedence checks} {expr {1&3ne3}} 0

test expr-old-17.1 {precedence checks} {expr {7&3^0x10}} 19
test expr-old-17.2 {precedence checks} {expr {7^0x10&3}} 7

test expr-old-18.1 {precedence checks} {expr {7^0x10|3}} 23
test expr-old-18.2 {precedence checks} {expr {7|0x10^3}} 23

test expr-old-19.1 {precedence checks} {expr {7|3&&1}} 1
test expr-old-19.2 {precedence checks} {expr {1&&3|7}} 1
test expr-old-19.3 {precedence checks} {expr {0&&1||1}} 1
test expr-old-19.4 {precedence checks} {expr {1||1&&0}} 1

test expr-old-20.1 {precedence checks} {expr {1||0?3:4}} 3
test expr-old-20.2 {precedence checks} {expr {1?0:4||1}} 0
test expr-old-20.3 {precedence checks} {expr {1?2:0?3:4}} 2
test expr-old-20.4 {precedence checks} {expr {0?2:0?3:4}} 4
test expr-old-20.5 {precedence checks} {expr {1?2?3:4:0}} 3
test expr-old-20.6 {precedence checks} {expr {0?2?3:4:0}} 0

# Parentheses.

test expr-old-21.1 {parenthesization} {expr {(2+4)*6}} 36
test expr-old-21.2 {parenthesization} {expr {(1?0:4)||1}} 1
test expr-old-21.3 {parenthesization} {expr {+(3-4)}} -1

# Embedded commands and variable names.

set a 16
test expr-old-22.1 {embedded variables} {expr {2*$a}} 32
test expr-old-22.2 {embedded variables} {
    set x -5
    set y 10
    expr {$x + $y}
} {5}
test expr-old-22.3 {embedded variables} {
    set x "  -5"
    set y "  +10"
    expr {$x + $y}
} {5}
test expr-old-22.4 {embedded commands and variables} {expr {[set a] - 14}} 2
test expr-old-22.5 {embedded commands and variables} -returnCodes error -body {
    expr {12 - [bad_command_name]}
} -result {invalid command name "bad_command_name"}

# Double-quotes and things inside them.

test expr-old-23.1 {double quotes} {expr {"abc"}} abc
test expr-old-23.2 {double quotes} {
    set a 189
    expr {"$a.bc"}

} {1 Testing}
test expr-old-23.8 {double quotes} {
    list [catch {expr {"12398712938788234-1298379" != ""}} msg] $msg
} {0 1}

# Numbers in various bases.

test expr-old-24.1 {numbers in different bases} {expr {0x20}} 32
test expr-old-24.2 {numbers in different bases} {expr {0o15}} 13

# Conversions between various data types.

test expr-old-25.1 {type conversions} {expr {2+2.5}} 4.5
test expr-old-25.2 {type conversions} {expr {2.5+2}} 4.5
test expr-old-25.3 {type conversions} {expr {2-2.5}} -0.5
test expr-old-25.4 {type conversions} {expr {2/2.5}} 0.8
test expr-old-25.5 {type conversions} {expr {2>2.5}} 0
test expr-old-25.6 {type conversions} {expr {2.5>2}} 1
test expr-old-25.7 {type conversions} {expr {2<2.5}} 1
test expr-old-25.8 {type conversions} {expr {2>=2.5}} 0
test expr-old-25.9 {type conversions} {expr {2<=2.5}} 1
test expr-old-25.10 {type conversions} {expr {2==2.5}} 0
test expr-old-25.11 {type conversions} {expr {2!=2.5}} 1
test expr-old-25.12 {type conversions} {expr {2>"ab"}} 0
test expr-old-25.13 {type conversions} {expr {2>" "}} 1
test expr-old-25.14 {type conversions} {expr {"24.1a" > 24.1}} 1
test expr-old-25.15 {type conversions} {expr {24.1 > "24.1a"}} 0
test expr-old-25.16 {type conversions} {expr {2+2.5}} 4.5
test expr-old-25.17 {type conversions} {expr {2+2.5}} 4.5
test expr-old-25.18 {type conversions} {expr {2.0e2}} 200.0
test expr-old-25.19 {type conversions} {expr {2.0e15}} 2000000000000000.0
test expr-old-25.20 {type conversions} {expr {10.0}} 10.0

# Various error conditions.

test expr-old-26.1 {error conditions} -returnCodes error -body {
    expr {2 + "a"}
} -result {can't use non-numeric string "a" as operand of "+"}
test expr-old-26.2 {error conditions} -body {
    expr {2 + 4 *}
} -returnCodes error -match glob -result *
test expr-old-26.3 {error conditions} -body {
    expr {2 + 4 * (}
} -returnCodes error -match glob -result *
unset -nocomplain _non_existent_
test expr-old-26.4 {error conditions} -returnCodes error -body {
    expr {2 + $_non_existent_}
} -result {can't read "_non_existent_": no such variable}
set a xx
test expr-old-26.5 {error conditions} -returnCodes error -body {
    expr {2+$a}
} -result {can't use non-numeric string "xx" as operand of "+"}
test expr-old-26.6 {error conditions} -returnCodes error -body {
    expr {2+[set a]}
} -result {can't use non-numeric string "xx" as operand of "+"}
test expr-old-26.7 {error conditions} -body {
    expr {2+(4}
} -returnCodes error -match glob -result *
test expr-old-26.8 {error conditions} {
    list [catch {expr {2 / 0}} msg] $msg $errorCode
} {1 {divide by zero} {ARITH DIVZERO {divide by zero}}}
test expr-old-26.9 {error conditions} {
    list [catch {expr {2 % 0}} msg] $msg $errorCode
} {1 {divide by zero} {ARITH DIVZERO {divide by zero}}}
test expr-old-26.10a {error conditions} !ieeeFloatingPoint {
    list [catch {expr {2.0 / 0.0}} msg] $msg $errorCode
} {1 {divide by zero} {ARITH DIVZERO {divide by zero}}}
test expr-old-26.10b {error conditions} ieeeFloatingPoint {
    list [catch {expr {2.0 / 0.0}} msg] $msg
} {0 Inf}
test expr-old-26.11 {error conditions} -body {
    expr 2`
} -returnCodes error -match glob -result *
test expr-old-26.12 {error conditions} -body {
    expr {a.b}
} -returnCodes error -match glob -result *
test expr-old-26.13 {error conditions} -returnCodes error -body {
    expr {"a"/"b"}
} -result {can't use non-numeric string "a" as operand of "/"}
test expr-old-26.14 {error conditions} -body {
    expr {2:3}
} -returnCodes error -match glob -result *
test expr-old-26.15 {error conditions} -body {
    expr {[email protected]}
} -returnCodes error -match glob -result *
test expr-old-26.16 {error conditions} -returnCodes error -body {
    expr "\$a+\[b"
} -match glob -result {missing close-bracket*}
test expr-old-26.17 {error conditions} -body {
    expr {a`b}
} -returnCodes error -match glob -result *
test expr-old-26.18 {error conditions} -body {
    expr \"a\"\{b
} -returnCodes error -match glob -result *
test expr-old-26.19 {error conditions} -body {
    expr a
} -returnCodes error -match glob -result *
test expr-old-26.20 {error conditions} -returnCodes error -body {
    expr
} -result {wrong # args: should be "expr expression"}
test expr-old-26.21 {error conditions} -returnCodes error -body {
    expr +1 +2
} -result {wrong # args: should be "expr expression"}

# Cancelled evaluation.

test expr-old-27.1 {cancelled evaluation} {
    set a 1
    expr {0&&[set a 2]}
    set a

test expr-old-30.2 {long values} {
    set a "000000000000000000000000000000"
    set a "$a$a$a$a$a$a$a$a$a$a$a$a$a$a$a$a${a}5"
    expr $a
} 5

# Expressions spanning multiple arguments
# TIP 526: expr-old-31.* now irrelevant













# Math functions

test expr-old-32.1 {math functions in expressions} {
    format %.6g [expr {acos(0.5)}]
} {1.0472}
test expr-old-32.2 {math functions in expressions} {
    format %.6g [expr {asin(0.5)}]
} {0.523599}
test expr-old-32.3 {math functions in expressions} {
    format %.6g [expr {atan(1.0)}]
} {0.785398}
test expr-old-32.4 {math functions in expressions} {
    format %.6g [expr {atan2(2.0, 2.0)}]
} {0.785398}
test expr-old-32.5 {math functions in expressions} {
    format %.6g [expr {ceil(1.999)}]
} {2}
test expr-old-32.6 {math functions in expressions} {
    format %.6g [expr {cos(.1)}]
} {0.995004}
test expr-old-32.7 {math functions in expressions} {
    format %.6g [expr {cosh(.1)}]
} {1.005}
test expr-old-32.8 {math functions in expressions} {
    format %.6g [expr {exp(1.0)}]
} {2.71828}
test expr-old-32.9 {math functions in expressions} {
    format %.6g [expr {floor(2.000)}]
} {2}
test expr-old-32.10 {math functions in expressions} {
    format %.6g [expr {floor(2.001)}]
} {2}
test expr-old-32.11 {math functions in expressions} {
    format %.6g [expr {fmod(7.3, 3.2)}]
} {0.9}
test expr-old-32.12 {math functions in expressions} {
    format %.6g [expr {hypot(3.0, 4.0)}]
} {5}
test expr-old-32.13 {math functions in expressions} {
    format %.6g [expr {log(2.8)}]
} {1.02962}
test expr-old-32.14 {math functions in expressions} {
    format %.6g [expr {log10(2.8)}]
} {0.447158}
test expr-old-32.15 {math functions in expressions} {
    format %.6g [expr {pow(2.1, 3.1)}]
} {9.97424}
test expr-old-32.16 {math functions in expressions} {
    format %.6g [expr {sin(.1)}]
} {0.0998334}
test expr-old-32.17 {math functions in expressions} {
    format %.6g [expr {sinh(.1)}]
} {0.100167}
test expr-old-32.18 {math functions in expressions} {
    format %.6g [expr {sqrt(2.0)}]
} {1.41421}
test expr-old-32.19 {math functions in expressions} {
    format %.6g [expr {tan(0.8)}]
} {1.02964}
test expr-old-32.20 {math functions in expressions} {
    format %.6g [expr {tanh(0.8)}]
} {0.664037}
test expr-old-32.21 {math functions in expressions} {
    format %.6g [expr {abs(-1.8)}]
} {1.8}
test expr-old-32.22 {math functions in expressions} {
    expr {abs(10.0)}
} {10.0}
test expr-old-32.23 {math functions in expressions} {
    format %.6g [expr {abs(-4)}]
} {4}
test expr-old-32.24 {math functions in expressions} {
    format %.6g [expr {abs(66)}]
} {66}

test expr-old-32.25a {math functions in expressions} {
    expr {abs(0x8000000000000000)}
} [expr {1 << 63}]

test expr-old-32.25b {math functions in expressions} {
    expr {abs(0x80000000)}
} 2147483648

test expr-old-32.26 {math functions in expressions} {
    expr {double(1)}
} {1.0}
test expr-old-32.27 {math functions in expressions} {
    expr {double(1.1)}
} {1.1}
test expr-old-32.28 {math functions in expressions} {
    expr {int(1)}
} {1}
test expr-old-32.29 {math functions in expressions} {
    expr {int(1.4)}
} {1}
test expr-old-32.30 {math functions in expressions} {
    expr {int(1.6)}
} {1}
test expr-old-32.31 {math functions in expressions} {
    expr {int(-1.4)}
} {-1}
test expr-old-32.32 {math functions in expressions} {
    expr {int(-1.6)}
} {-1}
test expr-old-32.33 {math functions in expressions} {
    expr {int(1e60)}
} 999999999999999949387135297074018866963645011013410073083904
test expr-old-32.34 {math functions in expressions} {
    expr {int(-1e60)}
} -999999999999999949387135297074018866963645011013410073083904
test expr-old-32.35 {math functions in expressions} {
    expr {round(1.49)}
} {1}
test expr-old-32.36 {math functions in expressions} {
    expr {round(1.51)}
} {2}
test expr-old-32.37 {math functions in expressions} {
    expr {round(-1.49)}
} {-1}
test expr-old-32.38 {math functions in expressions} {
    expr {round(-1.51)}
} {-2}
test expr-old-32.39 {math functions in expressions} {
    expr {round(1e60)}
} 999999999999999949387135297074018866963645011013410073083904
test expr-old-32.40 {math functions in expressions} {
    expr {round(-1e60)}
} -999999999999999949387135297074018866963645011013410073083904
test expr-old-32.41 {math functions in expressions} {
    list [catch {expr {pow(1.0 + 3.0 - 2, .8 * 5)}} msg] $msg
} {0 16.0}
test expr-old-32.42 {math functions in expressions} {
    list [catch {expr {hypot(5*.8, 3)}} msg] $msg
} {0 5.0}
test expr-old-32.45 {math functions in expressions} {
    expr {(0 <= rand()) && (rand() < 1)}
} {1}
test expr-old-32.46 {math functions in expressions} -body {
    list [catch {expr rand(24)} msg] $msg
} -match glob -result {1 {too many arguments for math function*}}
test expr-old-32.47 {math functions in expressions} -body {
    list [catch {expr srand()} msg] $msg
} -match glob -result {1 {not enough arguments for math function*}}
test expr-old-32.48 {math functions in expressions} -body {
    expr {srand(3.79)}
} -returnCodes error -match glob -result *
test expr-old-32.49 {math functions in expressions} -body {
    expr {srand("")}
} -returnCodes error -match glob -result *
test expr-old-32.50 {math functions in expressions} {
    set result [expr {round(srand(12345) * 1000)}]
    for {set i 0} {$i < 10} {incr i} {
	lappend result [expr {round(rand() * 1000)}]
    }
    set result
} {97 834 948 36 12 51 766 585 914 784 333}
test expr-old-32.51 {math functions in expressions} -body {
    expr {srand([lindex "6ty" 0])}
} -returnCodes error -match glob -result *
test expr-old-32.52 {math functions in expressions} {
    expr {srand(int(1<<37)) < 1}
} {1}
test expr-old-32.53 {math functions in expressions} {
    expr {srand((1<<31) - 1) > 0}
} {1}

test expr-old-33.1 {conversions and fancy args to math functions} {
    expr {hypot ( 3 , 4 )}
} 5.0
test expr-old-33.2 {conversions and fancy args to math functions} {
    expr {hypot ( (2.0+1.0) , 4 )}
} 5.0
test expr-old-33.3 {conversions and fancy args to math functions} {
    expr {hypot ( 3 , (3.0 + 1.0) )}
} 5.0
test expr-old-33.4 {conversions and fancy args to math functions} {
    format %.6g [expr {cos(acos(0.1))}]
} 0.1

test expr-old-34.1 {errors in math functions} -returnCodes error -body {
    expr {func_2(1.0)}
} -match glob -result {* "*func_2"}
test expr-old-34.2 {errors in math functions} -body {
    expr {func|(1.0)}
} -returnCodes error -match glob -result *
test expr-old-34.3 {errors in math functions} -returnCodes error -body {
    expr {hypot("a b", 2.0)}
} -result {expected floating-point number but got "a b"}
test expr-old-34.4 {errors in math functions} -body {
    expr {hypot(1.0 2.0)}
} -returnCodes error -match glob -result *
test expr-old-34.5 {errors in math functions} -body {
    expr {hypot(1.0, 2.0}
} -returnCodes error -match glob -result *
test expr-old-34.6 {errors in math functions} -body {
    expr {hypot(1.0 ,}
} -returnCodes error -match glob -result *
test expr-old-34.7 {errors in math functions} -body {
    list [catch {expr hypot(1.0)} msg] $msg
} -match glob -result {1 {not enough arguments for math function*}}
test expr-old-34.8 {errors in math functions} -body {
    list [catch {expr {hypot(1.0, 2.0, 3.0)}} msg] $msg
} -match glob -result {1 {too many arguments for math function*}}
test expr-old-34.9 {errors in math functions} {
    list [catch {expr {acos(-2.0)}} msg] $msg $errorCode
} {1 {domain error: argument not in valid range} {ARITH DOMAIN {domain error: argument not in valid range}}}
test expr-old-34.10 {errors in math functions} {
    list [catch {expr {pow(-3, 1000001)}} msg] $msg
} {0 -Inf}
test expr-old-34.11a {errors in math functions} !ieeeFloatingPoint {
    list [catch {expr {pow(3, 1000001)}} msg] $msg $errorCode
} {1 {floating-point value too large to represent} {ARITH OVERFLOW {floating-point value too large to represent}}}
test expr-old-34.11b {errors in math functions} ieeeFloatingPoint {
    list [catch {expr {pow(3, 1000001)}} msg] $msg
} {0 Inf}
test expr-old-34.12a {errors in math functions} !ieeeFloatingPoint {
    list [catch {expr {-14.0 * exp(100000)}} msg] $msg $errorCode
} {1 {floating-point value too large to represent} {ARITH OVERFLOW {floating-point value too large to represent}}}
test expr-old-34.12b {errors in math functions} ieeeFloatingPoint {
    list [catch {expr {-14.0 * exp(100000)}} msg] $msg
} {0 -Inf}
test expr-old-34.13 {errors in math functions} {
    expr {wide(1.0e30)}
} 5076964154930102272
test expr-old-34.14 {errors in math functions} {
    expr {wide(-1.0e30)}
} -5076964154930102272
test expr-old-34.15 {errors in math functions} {
    expr {round(1.0e30)}
} 1000000000000000019884624838656
test expr-old-34.16 {errors in math functions} {
    expr {round(-1.0e30)}
} -1000000000000000019884624838656

test expr-old-36.1 {ExprLooksLikeInt procedure} -body {
    expr {0o289}
} -returnCodes error -match glob -result {*invalid octal number*}
test expr-old-36.2 {ExprLooksLikeInt procedure} -returnCodes error -body {
    set x 0o289
    expr {$x + 1}
} -result {can't use non-numeric string "0o289" as operand of "+"}
test expr-old-36.3 {ExprLooksLikeInt procedure} {
    expr {0289.1}
} 289.1
test expr-old-36.4 {ExprLooksLikeInt procedure} {
    set x 0289.1
    expr {$x + 1}
} 290.1
test expr-old-36.5 {ExprLooksLikeInt procedure} {
    set x {  +22}
    expr {$x+1}
} 23
test expr-old-36.6 {ExprLooksLikeInt procedure} {
    set x {	-22}
    expr {$x + 1}
} -21
test expr-old-36.7 {ExprLooksLikeInt procedure} -returnCodes error -body {
    expr {nan}
} -result {domain error: argument not in valid range}
test expr-old-36.8 {ExprLooksLikeInt procedure} {
    expr {78e1}
} 780.0
test expr-old-36.9 {ExprLooksLikeInt procedure} {
    expr {24E1}
} 240.0
test expr-old-36.10 {ExprLooksLikeInt procedure} -body {
    expr {78e}
} -returnCodes error -match glob -result *

# test for [Bug #542588]
test expr-old-36.11 {ExprLooksLikeInt procedure} {
    # define a "too large integer"; this one works also for 64bit arith
    set x 665802003400000000000000
    expr {$x+1}
} 665802003400000000000001

# tests for [Bug #587140]
test expr-old-36.12 {ExprLooksLikeInt procedure} -returnCodes error -body {
    set x "10;"
    expr {$x + 1}
} -result {can't use non-numeric string "10;" as operand of "+"}
test expr-old-36.13 {ExprLooksLikeInt procedure} -returnCodes error -body {
    set x " +"
    expr {$x + 1}
} -result {can't use non-numeric string " +" as operand of "+"}
test expr-old-36.14 {ExprLooksLikeInt procedure} {
    set x "123456789012345678901234567890 "
    expr {$x + 1}
} 123456789012345678901234567891
test expr-old-36.15 {ExprLooksLikeInt procedure} -returnCodes error -body {
    set x "0o99 "
    expr {$x + 1}
} -result {can't use non-numeric string "0o99 " as operand of "+"}
test expr-old-36.16 {ExprLooksLikeInt procedure} {
    set x " 0xffffffffffffffffffffffffffffffffffffff  "
    expr {$x + 1}
} [expr {0x100000000000000000000000000000000000000}]

test expr-old-37.1 {Check that Tcl_ExprLong doesn't modify interpreter result if no error} testexprlong {
    testexprlong 4+1
} {This is a result: 5}
#Check for [Bug 1109484]
test expr-old-37.2 {Tcl_ExprLong handles wide ints gracefully} testexprlong {
    testexprlong wide(1)+2

#
# Test for bug #908375: rounding numbers that do not fit in a
# long but do fit in a wide
#

test expr-old-39.1 {Rounding with wide result} {
    set x 1.0e10
    set y [expr {$x + 0.1}]
    catch {
	set x [list [expr {$x == round($y)}] [expr {$x == -round(-$y)}]]
    }
    set x
} {1 1}
unset -nocomplain x y

#
# TIP #255 min and max math functions

test expr-old-40.5 {min math function} -body {
    expr {min("a", 0)}
} -returnCodes error -match glob -result *
test expr-old-40.6 {min math function} -body {
    expr {min(300, "0xFF")}
} -result 255
test expr-old-40.7 {min math function} -body {
    expr {min("1[string repeat 0 10000]", 1e300)}
} -result 1e+300
test expr-old-40.8 {min math function} -body {
    expr {min(0, "a")}
} -returnCodes error -match glob -result *

test expr-old-41.1 {max math function} -body {
    expr {max(0)}

test expr-old-41.5 {max math function} -body {
    expr {max("a", 0)}
} -returnCodes error -match glob -result *
test expr-old-41.6 {max math function} -body {
    expr {max(200, "0xFF")}
} -result 255
test expr-old-41.7 {max math function} -body {
    expr {max("1[string repeat 0 10000]", 1e300)}
} -result 1[string repeat 0 10000]
test expr-old-41.8 {max math function} -body {
    expr {max(0, "a")}
} -returnCodes error -match glob -result *

# Special test for Pentium arithmetic bug of 1994:

    return $result
}

# start of tests

catch {unset a b i x}

test expr-1.1 {TclCompileExprCmd: no expression} -body {
    expr
} -returnCodes error -result {wrong # args: should be "expr expression"}
test expr-1.2 {TclCompileExprCmd: one expression word} {
    expr +25
} 25
test expr-1.3 {TclCompileExprCmd: two arguments} -body {
    expr +1 +2

} -returnCodes error -result {wrong # args: should be "expr expression"}

# 1.4 no longer applies
test expr-1.5 {TclCompileExprCmd: quoted expression word} {
    expr "0005"
} 5
test expr-1.6 {TclCompileExprCmd: quoted expression word} {
    catch {expr "0005"zxy} msg
    set msg
} {extra characters after close-quote}

test expr-1.13 {TclCompileExprCmd: second level of substitutions in expr not in braces with single var reference} {
    set a xxx
    set x 27;  set bool {$x};  if $bool {set a foo}
    set a
} foo
test expr-1.14 {TclCompileExprCmd: second level of substitutions in expr with comparison as top-level operator} {
    set a xxx
    set x 2;  set b {$x};  set a [expr $b==2]
    set a
} 1
test expr-1.15 {TclCompileExprCmd: second level of substitutions in expr with comparison as top-level operator} {
    set a xxx
    set x 2;  set b {$x};  set a [expr "$b eq 2"]
    set a
} 1

test expr-2.1 {TclCompileExpr: are builtin functions registered?} {
    expr double(5*[llength "6 2"])
} 10.0
test expr-2.2 {TclCompileExpr: error in expr} -body {

    list [catch {expr 1?{$a}:0} msg] $msg
} {1 {can't read "a": no such variable}}
test expr-20.5 {proper double evaluation compilation, working case} {
    set a yellow
    expr 1?{$a}:0
} yellow
test expr-20.6 {handling of compile error in trial compile} {
    list [catch {expr {+[incr]}} msg] $msg
} {1 {wrong # args: should be "incr varName ?increment?"}}
test expr-20.7 {handling of compile error in runtime case} {
    list [catch {expr {+[error foo]}} msg] $msg
} {1 foo}

# Test for non-numeric boolean literal handling
test expr-21.1 	{non-numeric boolean literals} {expr false } false
test expr-21.2 	{non-numeric boolean literals} {expr true  } true
test expr-21.3 	{non-numeric boolean literals} {expr off   } off
test expr-21.4 	{non-numeric boolean literals} {expr on    } on

	test expr-31.$i.5.$j {boolean conversion} {
	    expr bool("[string range $s 0 $j]")
	} 0
	incr j
    }
    incr i
}
test expr-31.3.4.0 {boolean conversion} {expr {bool(n)}} 0
test expr-31.3.5.0 {boolean conversion} {expr {bool("n")}} 0
test expr-31.4.4.0 {boolean conversion} {expr {bool(f)}} 0
test expr-31.4.5.0 {boolean conversion} {expr {bool("f")}} 0
test expr-31.6  {boolean conversion} {expr {bool(-1 + 1)}} 0
test expr-31.7  {boolean conversion} {expr {bool(0 + 1)}} 1
test expr-31.8  {boolean conversion} {expr {bool(0.0)}} 0
test expr-31.9  {boolean conversion} {expr {bool(0x0)}} 0
test expr-31.10 {boolean conversion} {expr {bool(wide(0))}} 0
test expr-31.11 {boolean conversion} {expr {bool(5.0)}} 1
test expr-31.12 {boolean conversion} {expr {bool(5)}} 1
test expr-31.13 {boolean conversion} {expr {bool(0x5)}} 1
test expr-31.14 {boolean conversion} {expr {bool(wide(5))}} 1
test expr-31.15 {boolean conversion} -body {
    expr {bool("fred")}
} -returnCodes error -match glob -result *

test expr-32.1 {expr mod basics} {
    set mod_nums [list \
        {-3 1} {-3 2} {-3 3} {-3 4} {-3 5} \
        {-3 -1} {-3 -2} {-3 -3} {-3 -4} {-3 -5} \
        {-2 1} {-2 2} {-2 3} {-2 4} {-2 5} \