Difference between revisions of "Self-running source"

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[[Category:C]]
 
[[Category:C]]
 
[[Category:Programming]]
 
[[Category:Programming]]
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[[Category:C preprocessor snippets]]

Revision as of 09:17, 13 March 2020

C

Set the executable bit on the following polyglot C/shell source file:

#if 0
gcc -Wall $0 && exec ./a.out; exit
#endif

#include <stdio.h>

int main(int argc, char *argv[])
{
        printf("Hello world!\n");
        return 0;
}

This is my favourite version because:

  • readable (e.g. no multiline comments)
  • minimal boilerplate
  • only runs the program if it compiled successfully
  • exits with 1 if there was an error

See also