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

int main (void ) {
    
    int i=0 ;
    int n ;
    
    clock_t t0, t1 ;
    
    double duree , x=2.8 ;
    
    printf("Resolution CLOKS_PER_SEC=%ld\n", CLOCKS_PER_SEC);
    printf("Combien de milliers tours ? ");
    scanf("%d",&n);
    
    t0 = clock();
    while ( i < 1000*n ) {
          x = 1/sqrt(sin(x)); // un petit calcul ....
          i++;
          }
    t1 = clock();
 duree = (double)(t1 - t0 ) / CLOCKS_PER_SEC;
    
    printf("Duree pour %d calculs = %e s\n",1000*n, duree ); 
    
    
    return 0 ;
}