2D Reflection

#include<stdio.h>

#include<conio.h>

#include<math.h>

#include<graphics.h>

struct s

{ int x,y ;

};

void main()

{ int n;

int gd= DETECT ,gm;

 initgraph(&gd,&gm,"c:\\tc\\bgi");

 int xmax,ymax;

 xmax=getmaxx();

 ymax=getmaxy();

// cout<<xmax<<" "<<ymax;

 line(0,240,639,240);

 line(320,0,320,479);

 struct s inp[10],out[10];

 printf ("\n enter the no of vertices");

 scanf ("%d",&n);

 for(int i=0;i<n;i++)

   { scanf ("%d%d",&inp[i].x,&inp[i].y);

   }

   for(i=0;i<n;i++)

   {

   inp[i].x=inp[i].x+320;

   }

   printf("\n enter your choice for reflection along different axes");

   printf("\n 1  along x - axis");

   printf("\n 2 along y axis");

   printf("\n 3 along x=y axis");

   printf("\n 4 along x= -y axis");

   printf("\n 5 along origin");

   int ch;

   scanf ("%d",&ch);

   switch(ch)

   { case 1:  

for(i=0;i<n;i++)

                              {

                              out[i].x=inp[i].x;

                               out[i].y=(240-(inp[i].y))+240;

                                }

                             break;

     case 2: for( i=0;i<n;i++)

                                { out[i].x= 320-(inp[i].x-320);

                               out[i].y= inp[i].y;

                                }

                             break;

                           default :

 printf("\n wrong choice");

                           }

      inp[n]= inp[0];

      out[n] = out[0];

      for(i=0;i<n;i++)

       { setcolor(7);

                          line(inp[i].x,inp[i].y,inp[i+1].x,inp[i+1].y);

                          }

                          for(i=0;i<n;i++)

                          {

                          setcolor(5);

                          line(out[i].x,out[i].y,out[i+1].x,out[i+1].y);

                          }

                          getch();

                          for(i=0;i<n;i++)

                          {

 printf("%d%d",out[i].x,out[i].y);

                         }

                          getch();

                       

                          for(i=0;i<n;i++)

                          {

                          setcolor(5);

                          line(out[i].x,out[i].y,out[i+1].x,out[i+1].y);

                          }

                          getch();

                          closegraph();

                          }