【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;    }