Topic : C-Language Documentation Author : John Kormylo Version : C.HYP 1.0 Subject : Documentation/C-Language Nodes : 233 Index Size : 6362 HCP-Version : 3 Compiled on : Atari @charset : atarist @lang : en @default : @help : Help @options : +g -i -s +x +z -t4 @width : 75 View Ref-File[ #ifdef ] #ifdef macro If 'macro' is a defined macro name, nothing happens, If 'macro' is NOT a defined macro name, compilation stops until the next '#else' '#elif' or '#endif' directive. See also Preprocessor, #if and #ifndef.