Windows下獲得精確計時的方法[微秒級]

#include <Windows.h><br />#include <stdio.h></p><p>int main()<br />{<br /> LARGE_INTEGER start;<br /> LARGE_INTEGER end ;<br /> LARGE_INTEGER frequency;</p><p> int i = 0;</p><p> if (!QueryPerformanceFrequency(&frequency))<br /> {<br /> return -1;<br /> }</p><p> QueryPerformanceCounter(&start); //開始計時</p><p> for ( i = 0; i < 100000; ++i)<br /> {<br /> ;// 用迴圈來測試計時<br /> }</p><p> QueryPerformanceCounter(&end); //結束計時</p><p> printf("main cost:%f/n", (double)(end.QuadPart - start.QuadPart) / (double)frequency.QuadPart); //列印for迴圈執行時間</p><p> return 0;<br />}<br />