Print Clock with C Language

#include<stdio.h>
#include<graphics.h>
#include<conio.h>
#include<stdlib.h>
#include<math.h>
#include<dos.h>
void main()
{
    int gdriver=DETECT,gmode;
    double midx=350,midy=300;

    double x1,y1,x2,y2,x22,y22;
    int x,y,i,j=0;
    double theta=0,t;
    clrscr();
    initgraph(&gdriver,&gmode,"c:/tc/bgi");
    printf("\n Enter the 1st co-ordinate=");
    scanf("%lf%lf",&x1,&y1);
    printf("\n Enter the 2nd co-ordinate=");
    scanf("%lf%lf",&x2,&y2);

    clrscr();
    line(midx,midy-150,midx,midy+150);
    line(midx+150,midy,midx-150,midy);
    setcolor(2);
    outtextxy(midx,midy," origin");
    line(midx+x1,midy+y1,midx+x2,midy+y2);
    //getch();
    for(i=theta;i<=900;i++)
    {
    t=i*0.01744;
    x22=x2*cos(t)-y2*sin(t);
    y22=x2*sin(t)+y2*cos(t);
    line(midx+x1,midy+y1,midx+x22,midy+y22);
    setcolor(j);
    j=j+1;
    delay(20);
    if(i==900)

      exit(1);
    }
    getch();
}