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计时器的使用

  //Windows系统下time(),clock(),timeGetTime(),GetTickCount(),QueryPerformanceCounter()来计时 #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 秒 time_t timeBegin, timeEnd; timeBegin = time(NULL); Sleep(1000); timeEnd = time(NULL); printf("%d\n", timeEnd - timeBegin); //用clock()来计时 毫秒 clock_t clockBegin, clockEnd; clockBegin = clock(); Sleep(800); clockEnd = clock(); printf("%d\n", clockEnd - clockBegin); //用timeGetTime()来计时 毫秒 DWORD dwBegin, dwEnd; dwBegin = timeGetTime(); Sleep(800); dwEnd = timeGetTime(); printf("%d\n", dwEnd - dwBegin); //用GetTickCount()来计时 毫秒 DWORD dwGTCBegin, dwGTCEnd; dwGTCBegin = GetTickCount(); Sleep(800); dwGTCEnd = GetTickCount(); printf("%d\n", dwGTCEnd - dwGTCBegin); //用QueryPerformanceCounter()来计时 微秒 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 第二次计时器值%I64d 计时器差%I64d\n", c1, c2, c2 - c1); printf("计时%lf毫秒\n", (c2 - c1) * 1000 / dff); return 0; }
 
 
补充:web前端 , HTML/CSS  ,
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