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Diffstat (limited to 'doc/if.n')
| -rw-r--r-- | doc/if.n | 33 |
1 files changed, 20 insertions, 13 deletions
@@ -5,10 +5,8 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: if.n,v 1.5 2004/10/27 12:53:22 dkf Exp $ -'\" -.so man.macros .TH if n "" Tcl "Tcl Built-In Commands" +.so man.macros .BS '\" Note: do not modify the .SH NAME line immediately below! .SH NAME @@ -32,50 +30,59 @@ then \fBbody2\fR is executed, and so on. If none of the expressions evaluates to true then \fIbodyN\fR is executed. The \fBthen\fR and \fBelse\fR arguments are optional -``noise words'' to make the command easier to read. +.QW "noise words" +to make the command easier to read. There may be any number of \fBelseif\fR clauses, including zero. \fIBodyN\fR may also be omitted as long as \fBelse\fR is omitted too. The return value from the command is the result of the body script that was executed, or an empty string if none of the expressions was non-zero and there was no \fIbodyN\fR. .SH EXAMPLES +.PP A simple conditional: +.PP .CS \fBif\fR {$vbl == 1} { puts "vbl is one" } .CE .PP With an \fBelse\fR-clause: +.PP .CS \fBif\fR {$vbl == 1} { - puts "vbl is one" + puts "vbl is one" } \fBelse\fR { - puts "vbl is not one" + puts "vbl is not one" } .CE .PP With an \fBelseif\fR-clause too: +.PP .CS \fBif\fR {$vbl == 1} { - puts "vbl is one" + puts "vbl is one" } \fBelseif\fR {$vbl == 2} { - puts "vbl is two" + puts "vbl is two" } \fBelse\fR { - puts "vbl is not one or two" + puts "vbl is not one or two" } .CE .PP Remember, expressions can be multi-line, but in that case it can be a good idea to use the optional \fBthen\fR keyword for clarity: +.PP .CS \fBif\fR { - $vbl == 1 || $vbl == 2 || $vbl == 3 + $vbl == 1 + || $vbl == 2 + || $vbl == 3 } \fBthen\fR { - puts "vbl is one, two or three" + puts "vbl is one, two or three" } .CE - .SH "SEE ALSO" expr(n), for(n), foreach(n) - .SH KEYWORDS boolean, conditional, else, false, if, true +'\" Local Variables: +'\" mode: nroff +'\" End: |