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

void main(void)
{
	double  di,dj,dk=0; 
	double duration ;
	clock_t start, end;

    printf("starting C program ....\n");
    start = clock();

        for (di=1; di<=10000 ; di++)
	for (dj=1; dj<=10000 ; dj++) 
		dk+=sqrt(di*dj);

	end = clock();
	duration = (double) (end-start)/CLOCKS_PER_SEC ;
	printf("Final Sum is: %f\n",  dk);   // double result
	printf("Time for 1E8 double multiplies: %f secs\n", duration);
}