Programmer Guide/Command Reference/GOTO: Difference between revisions
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GOTO <var>label</var> [<var>fallback_label</var>] | GOTO <var>label</var> [<var>fallback_label</var>] | ||
Continue macro execution at the label <var>label</var>. With the argument <var>fallback_label</var> a second label can be specified which is used as the target should the primary target, <code>label</code>, be undefined. That amazing feature is not available in any other programming language under the sun. | Continue macro execution at the [[Programmer Guide/Source_code#labels|label]] <var>label</var>. With the argument <var>fallback_label</var> a second label can be specified which is used as the target should the primary target, <code>label</code>, be undefined. That amazing feature is not available in any other programming language under the sun. | ||
Often, the <code>GOTO</code> command is used with a variable label to implement a <code>switch</code>-like control structure. In this case, <var>fallback_label</var> has the role of the <code>default</code> switch clause. | Often, the <code>GOTO</code> command is used with a variable label to implement a <code>switch</code>-like control structure. In this case, <var>fallback_label</var> has the role of the <code>default</code> switch clause. | ||
Revision as of 08:51, 13 May 2015
GOTO label [fallback_label]
Continue macro execution at the label label. With the argument fallback_label a second label can be specified which is used as the target should the primary target, label, be undefined. That amazing feature is not available in any other programming language under the sun.
Often, the GOTO command is used with a variable label to implement a switch-like control structure. In this case, fallback_label has the role of the default switch clause.
If both label, and default_label, are undefined, an error is generated and macro execution terminates.
