Telescopic Squares

Telescopic Squares #include<iostream.h> #include<conio.h> #include<graphics.h> 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