#include<iostream>
#include<conio.h>
#include<graphics.h>
using namespace std;
void outsq(int,int);
void insq(int,int);
void set(int);
int x,y,a=0;
main()
{
int n;
cout<<"Enter number of telescopic squares: ";cin>>n;
if(n<=0) cout<<"invalid number...("<<n<<")"<<endl;
else{
int h=128;
y=240+h;
x=(640-2*h)/2;
int gdriver=DETECT,gmode;
initgraph (&gdriver,&gmode,"c:\tc\bgi");
moveto(x,y);
outsq(n,h);
closegraph();}
return 6;
}
//end of main
void outsq(int n,int h)
{
if(n==0) a-=90;
else{
setcolor(n);
set(h); lineto(x,y);getch();
a+=45;
insq(n,h);
a+=45; set(h) ; lineto(x,y);getch();
a+=90; set(2*h); lineto(x,y);
a+=90; set(2*h); lineto(x,y);
a+=90; set(2*h); lineto(x,y);getch();
}//end of else
}
//end of drawing the outsider square
void insq(int n,int h)
{
set(h); lineto(x,y);getch();
a+=45;
outsq(n-1,h/2);
setcolor(n);
a+=45; set(h) ; lineto(x,y);getch();
a+=90; set(2*h); lineto(x,y);
a+=90; set(2*h); lineto(x,y);
a+=90; set(2*h); lineto(x,y);getch();
}
//end of drawing the insider square
void set(int h)
{
a=a%360;
switch(a)
{case 0 :{x+=h ; break;}
case 45 :{x+=h/2; y-=h/2;break;}
case 90 :{ y-=h ;break;}
case 135:{x-=h/2; y-=h/2;break;}
case 180:{x-=h ; break;}
case 225:{x-=h/2; y+=h/2;break;}
case 270:{ y+=h ;break;}
case 315:{x+=h/2; y+=h/2;break;}
}//end of switch
}//end of setting X & Y
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