c语言计算程序运行时间

#include <stdio.h>
#include <time.h> 
#include <windows.h>
int main(int argc, char *argv[])
{
    clock_t start,end;
    start=clock();
    Sleep(1000); 
    end=clock();    
    
    printf("time is %lf
",(end-start)/(double)CLK_TCK);
    return 0;
}