函数名: difftime
功 能: 计算两个时刻之间的时间差
用 法: double difftime(time_t time2, time_t time1);
程序例:
#include <time.h> #include <stdio.h> #include <dos.h> #include <conio.h> int main(void) { time_t first, second; clrscr(); first = time(NULL); /* Gets system time */ delay(2000); /* Waits 2 secs */ second = time(NULL); /* Gets system time again */ printf("The difference is: %f \ seconds\n",difftime(second,first)); getch(); return 0; }
