Line Clipping Program Using C Programming

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
#define Round(val)((int)(val+.5))

int maxx,maxy,miny,minx;

void main()
{
     int gd=DETECT,gm;
     void clipping(int xa,int ya,int xb,int y);
     int xa,xb,ya,yb;
     printf("Enter the window coordination");
     scanf("%d%d%d%d",&minx,&maxy,&maxx,&miny);

     printf("Enter the two and points for the line");
     scanf("%d%d%d%d",&xa,&ya,&xb,&yb);

     initgraph(&gd,&gm,"");
     rectangle(minx,miny,maxx,maxy);
     line(xa,ya,xb,yb);
     getch();

     closegraph();
}

void clipping(int xa,int ya,int xb,int yb)
{
     int Dx=xb-xa,Dy=yb-ya,steps,k;
     int visible1=0,visible2=0;
     float xin,yin,x=xa,y=ya;

     if(abs(Dx)>abs(Dy))
        steps=abs(Dx);
     else
        steps=abs(Dy);

     xin=Dx/(float)steps;
     yin=Dy/(float)steps;
     putpixel(Round(x),Round(y),2);

    for(k=0;k<steps;k++)
   {
        x+=xin;
        y+=yin;
        if((y>miny && y<maxx))
        {
             visible1=1;
             putpixel(Round(x),Round(y),2);
         }
         else
        visible2=1;
    }

    if(visible1==0)
    outtextxy(20,200,"complextely visible");

    if(visible1==1 && visible2==1)
    outtextxy(20,20,"partialy visible");

    if(visible1==1&&visible2==0)
    outtextxy(20,20,"completly visible");
}