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Diffstat (limited to 'pkg/language/doc/if.hlp')
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diff --git a/pkg/language/doc/if.hlp b/pkg/language/doc/if.hlp new file mode 100644 index 00000000..eac7686f --- /dev/null +++ b/pkg/language/doc/if.hlp @@ -0,0 +1,65 @@ +.help "if,else" Feb86 language +.ih +NAME +if else -- conditional execution of a statement +.ih +SYNTAX +\fIif\fR (expression) statement1 [\fIelse\fR statement2] +.ih +ELEMENTS +.ls expression +A boolean valued expression. +.le +.ls statement1, statement2 +The statements to be executed (possibly compound, i.e., enclosed in +curly braces). +.le +.ih +DESCRIPTION +The \fIif\fR statement is used to execute a statement only if the +specified condition is true. An optional \fIelse\fR clause may be given +to execute a different statement if the condition is false. +.ih +EXAMPLES +1. Add X to Y only if X is less than Y. + +.nf + if (x < y) + y += x +.fi + +2. If X is less than 10 print "small", else print "big". + +.nf + if (x < 10) + print ("small") + else + print ("big") +.fi + +3. The \fIelse if\fR construct. + +.nf + if (str == "+") + val += x + else if (str == "-") + val -= x + else if + ... +.fi + +4. Nesting, use of braces. + +.nf + if (i > 0) { + if (i < 10) { + print ("0") + sum = sum * 10 + i + } else + print (" ") + } +.fi +.ih +SEE ALSO +for, case, break, next +.endhelp |