1 //该程序计算一个时间持续的时间  2 #include <iostream>  3 #include <time.h>  4 #include <stdlib.h>  5   6 using namespace std;  7   8 int main()  9 { 10     clock_t start, finish; 11     start = clock(); 12     cout << (double)start / CLOCKS_PER_SEC << endl; 13     int i = 10000000; 14     while(i--); 15     finish = clock(); 16     cout << (double)finish / CLOCKS_PER_SEC << endl; //将结果转化为以秒为单位 17     return 0; 18 }