简单的时钟程序

#include <graphics.h>
#include <stdio.h>
#include <time.h>
#include <math.h>

#define _CRT_SECURE_NO_DEPRECATE
#define pi 3.1415926
int main() {
	time_t t;
	int i = 0;
	struct tm* nowTime;
	int hour, min, sec;
	initgraph(640, 480);
	
	while (1) {
		
		for (i = 0; i <= 59; i++) {
			if (i % 5 == 0) {
				line(320 + 170 * sin(i * pi / 30), 240 - 170 * cos(i * pi / 30), 320 + 200 * sin(i * pi / 30), 240 - 200 * cos(i * pi / 30));
			}
			else {
				line(320 + 185 * sin(i * pi / 30), 240 - 185 * cos(i * pi / 30), 320 + 200 * sin(i * pi / 30), 240 - 200 * cos(i * pi / 30));
			}
		}
		circle(320, 240, 200);
		time(&t);
		nowTime = localtime(&t);
		hour = nowTime->tm_hour;
		min = nowTime->tm_min;
		sec = nowTime->tm_sec;
		setlinecolor(WHITE);
		line(320, 240, 320 + 60 * sin(pi * hour / 6), 240 - 60 * cos(pi * hour / 6));
		line(320, 240, 320 + 100 * sin(pi * min / 30), 240 - 100 * cos(pi * min / 30));
		line(320, 240, 320 + 160 * sin(pi * sec / 30), 240 - 160 * cos(pi * sec / 30));
		Sleep(100);
		cleardevice();
	}
	getchar();
	closegraph();
	return 0;
}