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| Note | ||
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As of July 25th, 2023, there is a content freeze on this page. |
The #if compiler directive is used to test an expression for conditional compilation.
If the conditional expression is true, source lines following the #if directive are selected to be read by the compiler. Otherwise, lines are excluded until the next #elseif, #else, or #endif in the same #if group are reached.
The syntax is as follows:
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#if defined(condition-name) |
or
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#if not defined(condition-name) |
Example:
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#if not defined(ranonce) // this code will only run one time // even if this source file is included more than once with #include number = number + 1; #endif #define ranonce |
RPG Equivalent:
/IF