How to check the performance: difftime

#include <time.h>
#include <stdio.h>

int main(void)
{
  time_t start,end;
  volatile long unsigned t;

  start = time(NULL);
  for(t = 0; t < 5000000; t++) 
      ;
  end = time(NULL);
  
  printf("Loop used %f seconds.\n", difftime(end, start));

  return 0;
}

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How to check the performance: difftime : Time Date « Development « C / ANSI-C

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