Scaling a 2D Polygon

#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");

 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);

   }

   int sx,sy;

   printf("\n Enter the scaling value");

   scanf ("%d%d",&sx,&sy);

   for(i=0;i<n;i++)

    { out[i].x= inp[i].x * sx;

      out[i].y = inp[i].y * sy;

      }

      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);

                                   }

                                   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();

                                   }