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| author | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-30 14:21:51 (GMT) |
|---|---|---|
| committer | dkf <donal.k.fellows@manchester.ac.uk> | 2007-10-30 14:21:51 (GMT) |
| commit | b8cc0555e4a6f0b2c271a0ac7e79b336600ab693 (patch) | |
| tree | 77936c7b4f5275df9c18cb6d17ea16a11b1e4da6 /doc/expr.n | |
| parent | 225f9b14ff3fc2dc6fde1d46866e63e00c2c6690 (diff) | |
| download | tcl-b8cc0555e4a6f0b2c271a0ac7e79b336600ab693.zip tcl-b8cc0555e4a6f0b2c271a0ac7e79b336600ab693.tar.gz tcl-b8cc0555e4a6f0b2c271a0ac7e79b336600ab693.tar.bz2 | |
Clear up what's going on a bit more. [Bug 1811803]
Diffstat (limited to 'doc/expr.n')
| -rw-r--r-- | doc/expr.n | 28 |
1 files changed, 18 insertions, 10 deletions
@@ -6,7 +6,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: expr.n,v 1.29 2007/10/29 11:28:50 dkf Exp $ +'\" RCS: @(#) $Id: expr.n,v 1.30 2007/10/30 14:21:52 dkf Exp $ '\" .so man.macros .TH expr n 8.5 Tcl "Tcl Built-In Commands" @@ -17,7 +17,6 @@ expr \- Evaluate an expression .SH SYNOPSIS \fBexpr \fIarg \fR?\fIarg arg ...\fR? .BE - .SH DESCRIPTION .PP Concatenates \fIarg\fRs (adding separator spaces between them), @@ -210,11 +209,18 @@ not needed to determine the outcome. For example, in the command .CS \fBexpr {$v ? [a] : [b]}\fR .CE -only one of \fB[a]\fR or \fB[b]\fR will actually be evaluated, +only one of +.QW \fB[a]\fR +or +.QW \fB[b]\fR +will actually be evaluated, depending on the value of \fB$v\fR. Note, however, that this is only true if the entire expression is enclosed in braces; otherwise -the Tcl parser will evaluate both \fB[a]\fR and \fB[b]\fR before -invoking the \fBexpr\fR command. +the Tcl parser will evaluate both +.QW \fB[a]\fR +and +.QW \fB[b]\fR +before invoking the \fBexpr\fR command. .SS "MATH FUNCTIONS" .PP .VS 8.5 @@ -229,6 +235,11 @@ is the same in every way as the processing of: .CS \fBexpr {[tcl::mathfunc::sin [expr {$x+$y}]]}\fR .CE +which in turn is the same as the processing of: +.CS +\fBtcl::mathfunc::sin [expr {$x+$y}]\fR +.CE +.PP The executor will search for \fBtcl::mathfunc::sin\fR using the usual rules for resolving functions in namespaces. Either \fB::tcl::mathfunc::sin\fR or \fB[namespace @@ -382,16 +393,13 @@ Generate a random integer in the range 0..99 inclusive: .CS set randNum [\fBexpr\fR { int(100 * rand()) }] .CE - .SH "SEE ALSO" array(n), for(n), if(n), mathfunc(n), namespace(n), proc(n), string(n), Tcl(n), while(n) - .SH KEYWORDS arithmetic, boolean, compare, expression, fuzzy comparison - .SH COPYRIGHT +.ni Copyright (c) 1993 The Regents of the University of California. -.br Copyright (c) 1994-2000 Sun Microsystems Incorporated. -.br Copyright (c) 2005 by Kevin B. Kenny <kennykb@acm.org>. All rights reserved. +.fi |