【C语言】测试程序运行时间

#include <time.h>
int main() {
clock_t start,finish;
double duration;
start=clock();
//
//      需要测试的代码
//
finish = clock();
duration = (double)(finish - start) / CLOCKS_PER_SEC;
printf("用时:%f seconds\n", duration);
return 0;
}