Simple Analog Clock- C program

This is very simple program for simple clock.Here the use of cleardevice() is eliminated because cleardevice() cause blinking of screen.Several steps of program is repeated with the color black -which is similar to clearsdevice() and avoids blinking.
       

                                                                    ANALOG CLOCK


#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
#include<dos.h>
void circles();
 int main()
{
    int xf,yf,x1,y1,x2,y2,k=0,x3,y3,x4,y4;
    float t,i=0.0,j=0.0;
    initwindow(1050, 1050, "First Sample");
       xf=249;
       yf=251;
       t=3.14/180;
       for(;;i=i+0.2,j=j+0.6,k=k+6)
        {
            setcolor(0);
            circles();
                
                
        x1=xf+(250-xf)*cos((i-0.2)*t)-(250-yf)*sin((i-0.2)*t);
        y1=yf+(250-xf)*sin((i-0.2)*t)+(250-yf)*cos((i-0.2)*t);
        x2=xf+(250-xf)*cos((i-0.2)*t)-(350-yf)*sin((i-0.2)*t);
        y2=yf+(250-xf)*sin((i-0.2)*t)+(350-yf)*cos((i-0.2)*t);
       
        line(x1,y1,x2,y2);
       
        x1=xf+(250-xf)*cos((j-0.6)*t)-(250-yf)*sin((j-0.6)*t);
        y1=yf+(250-xf)*sin((j-0.6)*t)+(250-yf)*cos((j-0.6)*t);
        x2=xf+(250-xf)*cos((j-0.6)*t)-(400-yf)*sin((j-0.6)*t);
        y2=yf+(250-xf)*sin((j-0.6)*t)+(400-yf)*cos((j-0.6)*t);
       
        line(x1,y1,x2,y2);
       
       
        x1=xf+(250-xf)*cos((k-6)*t)-(250-yf)*sin((k-6)*t);
        y1=yf+(250-xf)*sin((k-6)*t)+(250-yf)*cos((k-6)*t);
        x2=xf+(250-xf)*cos((k-6)*t)-(450-yf)*sin((k-6)*t);
        y2=yf+(250-xf)*sin((k-6)*t)+(450-yf)*cos((k-6)*t);
       
        line(x1,y1,x2,y2);
       
        setcolor(12);
        circles();
       
        x1=xf+(250-xf)*cos(i*t)-(250-yf)*sin(i*t);
        y1=yf+(250-xf)*sin(i*t)+(250-yf)*cos(i*t);
        x2=xf+(250-xf)*cos(i*t)-(350-yf)*sin(i*t);
        y2=yf+(250-xf)*sin(i*t)+(350-yf)*cos(i*t);
       
        line(x1,y1,x2,y2);
       
        x1=xf+(250-xf)*cos(j*t)-(250-yf)*sin(j*t);
        y1=yf+(250-xf)*sin(j*t)+(250-yf)*cos(j*t);
        x2=xf+(250-xf)*cos(j*t)-(400-yf)*sin(j*t);
        y2=yf+(250-xf)*sin(j*t)+(400-yf)*cos(j*t);
       
        line(x1,y1,x2,y2);
       
        x1=xf+(250-xf)*cos(k*t)-(250-yf)*sin(k*t);
        y1=yf+(250-xf)*sin(k*t)+(250-yf)*cos(k*t);
        x2=xf+(250-xf)*cos(k*t)-(450-yf)*sin(k*t);
        y2=yf+(250-xf)*sin(k*t)+(450-yf)*cos(k*t);
       
        line(x1,y1,x2,y2);
       delay(850);
       
       
        }
getch();
}
 void circles()
 {
                 circle(250,250,1.5);
                 circle(250,250,2);
                 circle(250,250,3);
                 circle(250,250,4);
                 circle(250,250,225);
                 circle(30,250,4);
                 circle(471,250,4);
                 circle(250,29,4);
                 circle(250,471,4);
 }   

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