统计代码运行时间计时器

linux

#include <sys/time.h>  

#include <iostream>  

#include <time.h>  

double get_wall_time()  

{  

    struct timeval time ;  

    if (gettimeofday(&time,NULL)){  

        return 0;  

    }  

    return (double)time.tv_sec + (double)time.tv_usec * .000001; 

}  

int main()  

{  

    unsigned int t = 0;  

    double start_time = get_wall_time(); 

    while(t++ < 10e+6);  

    double end_time = get_wall_time() ;

    std::cout<<"循环耗时为:"<<end_time-start_time<<"ms";  

    return 0;  

} 

windows

#include <windows.h>  

#include <iostream>  

int main()  

{  

    DWORD start, stop;  

    unsigned int t = 0;  

    start = GetTickCount();  

    while (t++ < 10e+6);  

    stop = GetTickCount();  

    printf("time: %lld ms\n", stop - start);  

    return 0;  

}  

原文地址：https://www.cnblogs.com/Malphite/p/10952791.html