#elif Directive

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The #elifdirective initiates the start of another condition after a previous conditional compilation. The block of code from the preceding #if, , #elif, #ifdefor #ifndefdirective completes.

Very large array

#include <stdio.h>
#define ARRAY_SIZE 10000000

int main(){
  #if ARRAY_SIZE > 1000
    printf("Large array\n");
  #elif ARRAY_SIZE > 100000
    printf("Very large array\n");
  #endif
  return 0;
}

Details

Any number #elifof directives can appear within a conditional compilation.