C库函数 - clock()

#include <time.h>

#include <stdio.h>



int main () {

   clock_t start_t, end_t, total_t;

   int i;



   start_t = clock();

   printf("Starting of the program, start_t = %ld\n", start_t);



   printf("Going to scan a big loop, start_t = %ld\n", start_t);

   for(i=0; i< 10000000; i++) {

   }

   end_t = clock();

   printf("End of the big loop, end_t = %ld\n", end_t);



   total_t = (double)(end_t - start_t) / CLOCKS_PER_SEC;

   printf("Total time taken by CPU: %f\n", total_t  );

   printf("Exiting of the program...\n");



   return(0);

}