bench.c

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

int main () {
  clock_t begin = clock();

  int ni = 3000, nj = 3000, nk = 3000;

  for(int i = 0; i < ni; i++) {
    for(int j = 0; j < nj; j++) {
      for(int k = 0; k < nk; k++) {
        int result = i * j * k;
      }
    }
  } 
  
  clock_t end = clock();
  double time_spent = (double)(end - begin) / CLOCKS_PER_SEC;

  printf("%f", time_spent);
  return 0;
}