只可以粗略的記錄時間，若要更精確的計時可以使用<sys/time.h>下的函式

#include <stdio.h>
#include <time.h>
#include <Windows.h>
void main(){
	clock_t startTime, endTime;
	startTime = clock();
	//暫時掛起程式1秒
	Sleep(1000);
	endTime = clock();
	printf("startTime = %f\tendTime = %f\n", (double)startTime / CLOCKS_PER_SEC, (double)endTime / CLOCKS_PER_SEC);
	printf("the program has run:\t%f\n", (double)((endTime - startTime) / CLOCKS_PER_SEC));
	getchar();
}