方法一：用clock_t 

#include 
     
      #include 
      
       using namespace std;clock_t begin = clock();..............clock_t end = clock();double  cost = (double)(end - begin)/ (double)CLOCKS_PER_SEC * 1000;cout << "运行时间：" << cost << "ms" << endl;
      
     

　方法二： 用time_t 

 

#include 
     
      time_t begin;time_t end;begin = time(NULL);................程序代码end = time(NULL);cout << "程序运行时间： " <<  end - begin << "second " << endl;