Cohen Sutherland Line Clipping in C++

#include<iostream>
using namespace std;
#include "graphics.h"

#define INSIDE 0
#define LEFT 1
#define RIGHT 2
#define BOTTOM 4
#define TOP 8

int code(int x,int y,int xmin,int ymin,int xmax,int ymax)
{
 int outcode;

 if(x<xmin)
  outcode=LEFT;
 else if(x>xmax)
  outcode=RIGHT;
 else if(y<ymin)
  outcode=BOTTOM;
 else if(y>xmax)
  outcode=TOP;
 else
  outcode=INSIDE;

 return outcode;

}

void clip(int x1,int y1,int x2,int y2,int xmin,int ymin,int xmax,int ymax)
{
 int outcode1=code(x1,y1,xmin,ymin,xmax,ymax);
 int outcode2=code(x2,y2,xmin,ymin,xmax,ymax);
 bool accept=false;

 while(true)
 {
  if(!(outcode1 | outcode2))
  {
   accept=true;
   break;
  }
  else if(outcode1 & outcode2)
   break;
  else
  {
   int x,y;

   int outcodeout=outcode1?outcode1:outcode2;

   if(outcodeout & TOP)
   {
    x=x1+(x2-x1)*(ymax-y1)/(y2-y1);
    y=ymax;
   }
   else if(outcodeout & BOTTOM)
   {
    x=x1+(x2-x1)*(ymin-y1)/(y2-y1);
    y=ymin;
   }
   else if(outcodeout & RIGHT)
   {
    y=y1+(y2-y1)*(xmax-x1)/(x2-x1);
    x=xmax;
   }
   else
   {
    y=y1+(y2-y1)*(xmin-x1)/(x2-x1);
    x=xmin;
   }

   if(outcodeout == outcode1)
   {
    x1=x;
    y1=y;
    outcode1=code(x1,y1,xmin,ymin,xmax,ymax);
   }
   else
   {
    x2=x;
    y2=y;
    outcode2=code(x2,y2,xmin,ymin,xmax,ymax);
   }
  }
 }

 if(accept)
 {
  rectangle(xmin,ymin,xmax,ymax);
  line(x1,y1,x2,y2);
 }     
 
}

int main()
{
 int x1,y1,x2,y2,tx,ty,xmin,ymin,xmax,ymax;
 xmin=150;
 ymin=150;
 xmax=350;
 ymax=350;
 /*initwindow(1000,700,"Cohen Sutherland");*/
 cout<<"\n Enter the initial points of the line : ";
 cout<<"\n X-axis : ";
 cin>>x1;
 cout<<" Y-axis : ";
 cin>>y1;
 cout<<"\n Enter the final points of the line : ";
 cout<<"\n X-axis : ";
 cin>>x2;
 cout<<" Y-axis : ";
 cin>>y2;
 if(x1>x2)
 {
  tx=x1,ty=y1;
  x1=x2,y1=y2;
  x2=tx,y2=ty;
 }
 initwindow(1000,700,"Cohen Sutherland");
 cleardevice();
 rectangle(xmin,ymin,xmax,ymax);
 line(x1,y1,x2,y2);

 while(!kbhit()){}
 cleardevice();
 clip(x1,y1,x2,y2,xmin,ymin,xmax,ymax);
 getch();
 while(!kbhit()){}
 return 0;
}