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Description:
  hilbert.cpp
Language: C/C++
Code:
#include<iostream>
#include<stdio.h>
#include<graphics.h>
#include<math.h>
#include<stdlib.h>
using namespace std;
void move(int j,int h,int &x,int &y)
{
     if(j==1)
          y-=h;
     else if(j==2)
          x+=h;
     else if(j==3)
          y+=h;
     else if(j==4)
          x-=h;
     lineto(x,y);
}
void hilbert(int r,int d,int l,int u,int i,int h,int &x,int &y)
{
     if(i>0)
     {
          i--;
          hilbert(d,r,u,l,i,h,x,y);
          move(r,h,x,y);
          hilbert(r,d,l,u,i,h,x,y);
          move(d,h,x,y);     
          hilbert(r,d,l,u,i,h,x,y);
          move(l,h,x,y);
          hilbert(u,l,d,r,i,h,x,y);
     }
}
int main()
{
     int n,x1,y1;
     int x0=50,y0=150,x,y,h=10,r=2,d=3,l=4,u=1;
     cout<<"n Enter the n:";
     cin>>n;
     x=x0;y=y0;
     int gd=DETECT,gm;
     initgraph(&gd,&gm,NULL);
     moveto(x,y);
     hilbert(r,d,l,u,n,h,x,y);
     getch();
     closegraph();
     return 0;
}
          
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