Benchmarking C code for college assignments

benchmarking.c

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

int main(int argc, char const *argv[]) {
  
     /* benchmarking */
    clock_t start_t, end_t;
    float delta_t = 0.0;
  
    start_t = clock();
    /* what do you want to benchmark? */
    end_t = clock();
    delta_t = ((float)(end_t - start_t) / 1000000000000.0F ) * CLOCKS_PER_SEC;
    printf("Elapsed time: %lf\n", delta_t);
  
    return 0; 
  
}