diff options
Diffstat (limited to 'doc/expr.n')
| -rw-r--r-- | doc/expr.n | 26 |
1 files changed, 15 insertions, 11 deletions
@@ -28,7 +28,7 @@ Expressions almost always yield numeric results For example, the expression .PP .CS -\fBexpr 8.2 + 6\fR +\fBexpr\fR 8.2 + 6 .CE .PP evaluates to 14.2. @@ -68,7 +68,8 @@ Operands may be specified in any of the following ways: .IP [1] As a numeric value, either integer or floating-point. .IP [2] -As a boolean value, using any form understood by \fBstring is boolean\fR. +As a boolean value, using any form understood by \fBstring is\fR +\fBboolean\fR. .IP [3] As a Tcl variable, using standard \fB$\fR notation. The variable's value will be used as the operand. @@ -225,7 +226,7 @@ just as in C, which means that operands are not evaluated if they are not needed to determine the outcome. For example, in the command .PP .CS -\fBexpr {$v ? [a] : [b]}\fR +\fBexpr\fR {$v ? [a] : [b]} .CE .PP only one of @@ -248,19 +249,19 @@ Tcl function in the \fBtcl::mathfunc\fR namespace. The processing of an expression such as: .PP .CS -\fBexpr {sin($x+$y)}\fR +\fBexpr\fR {sin($x+$y)} .CE .PP is the same in every way as the processing of: .PP .CS -\fBexpr {[tcl::mathfunc::sin [expr {$x+$y}]]}\fR +\fBexpr\fR {[tcl::mathfunc::sin [\fBexpr\fR {$x+$y}]]} .CE .PP which in turn is the same as the processing of: .PP .CS -\fBtcl::mathfunc::sin [expr {$x+$y}]\fR +tcl::mathfunc::sin [\fBexpr\fR {$x+$y}] .CE .PP The executor will search for \fBtcl::mathfunc::sin\fR using the usual @@ -335,8 +336,8 @@ is that produced by the \fB%g\fR format specifier of Tcl's \fBformat\fR command. For example, the commands .PP .CS -\fBexpr {"0x03" > "2"}\fR -\fBexpr {"0y" < "0x12"}\fR +\fBexpr\fR {"0x03" > "2"} +\fBexpr\fR {"0y" < "0x12"} .CE .PP both return 1. The first comparison is done using integer @@ -358,9 +359,9 @@ once by the Tcl parser and once by the \fBexpr\fR command. For example, the commands .PP .CS -\fBset a 3\fR -\fBset b {$a + 2}\fR -\fBexpr $b*4\fR +set a 3 +set b {$a + 2} +\fBexpr\fR $b*4 .CE .PP return 11, not a multiple of 4. @@ -444,3 +445,6 @@ Copyright (c) 1993 The Regents of the University of California. Copyright (c) 1994-2000 Sun Microsystems Incorporated. Copyright (c) 2005 by Kevin B. Kenny <kennykb@acm.org>. All rights reserved. .fi +'\" Local Variables: +'\" mode: nroff +'\" End: |