#include <stdio.h>


int main()
{
#ifdef DEBUG
  printf("Compiled: " __DATE__ " at " __TIME__ "\n");
  printf("Debugging file %s\n", __FILE__);
#else
          /* no action */
#endif

#ifdef DEBUG
  printf("at line %d of file %s, about to call printf...\n", __LINE__, __FILE__);
#endif
  printf("hello world\n");

#ifndef DEBUG
  printf("\nNo debugging info displayed.\n");
#endif
  return 0;
}