Scaling

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

void main()
{
   /* request auto detection */
   int gdriver = DETECT, gmode, errorcode;
   int maxx, maxy;

   /* our polygon array */
   int poly[10];

   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "C:\\TC\\BGI");

   /* read result of initialization */
   errorcode = graphresult();
   if (errorcode != grOk)
   /* an error occurred */
   {
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
   /* terminate with an error code */
      exit(1);
   }
  // printf("Enter the ")
   int a[8]={25,25,32,20,30,40,25,25}, b[8], c[8],i;
   drawpoly(4,a);
   for( i=0;i<=8;i++)
   b[i]=(a[i]*2)+100;
   drawpoly(4,b);
   for(i=0;i<=8;i++)
   c[i]=(b[i]*2)+100;
   drawpoly(4,c);
   getch();
}