C++计时器

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/Windows系统下可以用 time()，clock()，timeGetTime()，GetTickCount()，QueryPerformanceCounter()来对一段程序代码进行计时#include <stdio.h>#include <windows.h>#include <time.h>                   //time_t time()  clock_t clock()    #include <Mmsystem.h>               //timeGetTime()    #pragma comment(lib, "Winmm.lib")   //timeGetTime()   //使用方法：将Sleep()函数换成需要测试运行时间的函数即可。int main(){   //用time()来计时，以秒为单位    time_t timeBegin, timeEnd;    timeBegin = time(NULL);    Sleep(1000);    timeEnd = time(NULL);    printf("%d\n", timeEnd - timeBegin);    //用clock()来计时，以毫秒为单位    clock_t  clockBegin, clockEnd;    clockBegin = clock();    Sleep(800);    clockEnd = clock();    printf("%d\n", clockEnd - clockBegin);    //用timeGetTime()来计时，以毫秒为单位    DWORD  dwBegin, dwEnd;    dwBegin = timeGetTime();    Sleep(800);    dwEnd = timeGetTime();    printf("%d\n", dwEnd - dwBegin);    //用GetTickCount()来计时，以毫秒为单位    DWORD  dwGTCBegin, dwGTCEnd;    dwGTCBegin = GetTickCount();    Sleep(800);    dwGTCEnd = GetTickCount();    printf("%d\n", dwGTCEnd - dwGTCBegin);    //用QueryPerformanceCounter()来计时，以微秒为单位    LARGE_INTEGER  large_interger;    double dff;    __int64  c1, c2;    QueryPerformanceFrequency(&large_interger);    dff = large_interger.QuadPart;    QueryPerformanceCounter(&large_interger);    c1 = large_interger.QuadPart;    Sleep(800);    QueryPerformanceCounter(&large_interger);    c2 = large_interger.QuadPart;    printf("本机高精度计时器频率%lf\n", dff);    printf("第一次计时器值%I64d\n第二次计时器值%I64d\n计时器差%I64d\n", c1, c2, c2 - c1);    printf("计时%lf毫秒\n\n", (c2 - c1) * 1000 / dff);    return 0;}
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