include bios include conio include dos include graphics include math i

#include<bios.h>
#include<conio.h>
#include<dos.h>
#include<graphics.h>
#include<math.h>
#include<stdio.h>
#include<stdlib.h>

int arrow_draw(int x, int y, int val, char type)
{
	int xa,ya,len,temp;
	double angle;
	switch(type)
	{
		case 's':
		{
			len=80;
			angle = (-90+val*6) * M_PI/180;
			temp = (int)floor(len*cos(angle));
			xa=x+temp;
			temp = (int)floor(len*sin(angle));
			ya=y+temp;
			break;

		}
		case 'm':
		{
			len=60;
			angle = (-90+val*6) * M_PI/180;
			temp = (int)floor(len*cos(angle));
			xa=x+temp;
			temp = (int)floor(len*sin(angle));
			ya=y+temp;
			break;
		}
		case 'h':
		{
			len=40;
			angle = (540 + val*30 + 90) * M_PI/180;
			temp = (int)floor(len*cos(angle));
			xa=x+temp;
			temp = (int)floor(len*sin(angle));
			ya=y+temp;
			break;
		}
	}
	line(x,y,xa,ya);
	return 0;
}

int main(void)
{
	int gdriver = DETECT, gmode;

	initgraph(&gdriver, &gmode, "e:/subject/bc/bgi");

	int midx,midy,rad=100;
	midx = getmaxx()/2;
	midy = getmaxy()/2;

	circle(midx,midy,rad);

	int cur_s,cur_m,cur_h,pr_s,pr_m,pr_h;
	struct time t;

	while(bioskey(1)==0)
	{
		gettime(&t);

		pr_s = cur_s;
		pr_m = cur_m;
		pr_h = cur_h;

		cur_s = t.ti_sec;
		cur_m = t.ti_min;
		cur_h = t.ti_hour;
		gotoxy(1,1);printf("%2d:%2d:%2d\n",cur_h,cur_m,cur_s);


		if(pr_h!=cur_h)
		{
			setcolor(BLACK);
			arrow_draw(midx,midy,pr_h,'h');
			setcolor(WHITE);
			arrow_draw(midx,midy,cur_h,'h');
		}

		if(pr_m!=cur_m)
		{
			setcolor(BLACK);
			arrow_draw(midx,midy,pr_m,'m');
			setcolor(WHITE);
			arrow_draw(midx,midy,cur_m,'m');
		}

		if(pr_s!=cur_s)
		{
			setcolor(BLACK);
			arrow_draw(midx,midy,pr_s,'s');
			setcolor(WHITE);
			arrow_draw(midx,midy,cur_s,'s');
		}

		sleep(1);
	}

	getch();
	closegraph();
	return 0;
}