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#include<stdio.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<<"Give the value of n\t";
	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;
}

prog.c:4:1: error: unknown type name ‘using’
 using namespace std;
 ^~~~~
prog.c:4:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘std’
 using namespace std;
                 ^~~
prog.c:6:29: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void move(int j, int h, int &x, int &y)
                             ^
prog.c:19:60: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void hilbert(int r, int d, int l, int u, int i, int h, int &x, int &y)
                                                            ^
prog.c: In function ‘main’:
prog.c:39:2: error: ‘cout’ undeclared (first use in this function)
  cout<<"Give the value of n\t";
  ^~~~
prog.c:39:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:40:2: error: ‘cin’ undeclared (first use in this function); did you mean ‘main’?
  cin>>n;
  ^~~
  main
prog.c:43:9: error: ‘DETECT’ undeclared (first use in this function)
  int gd=DETECT, gm;
         ^~~~~~
prog.c:44:2: error: implicit declaration of function ‘initgraph’ [-Werror=implicit-function-declaration]
  initgraph(&gd,&gm,NULL);
  ^~~~~~~~~
prog.c:45:2: error: implicit declaration of function ‘moveto’ [-Werror=implicit-function-declaration]
  moveto(x,y);
  ^~~~~~
prog.c:46:2: error: implicit declaration of function ‘hilbert’ [-Werror=implicit-function-declaration]
  hilbert(r,d,l,u,n,h,x,y);
  ^~~~~~~
prog.c:47:2: error: implicit declaration of function ‘getch’; did you mean ‘getc’? [-Werror=implicit-function-declaration]
  getch();
  ^~~~~
  getc
prog.c:48:2: error: implicit declaration of function ‘closegraph’ [-Werror=implicit-function-declaration]
  closegraph();
  ^~~~~~~~~~
prog.c:36:12: error: unused variable ‘y1’ [-Werror=unused-variable]
  int n, x1,y1;
            ^~
prog.c:36:9: error: unused variable ‘x1’ [-Werror=unused-variable]
  int n, x1,y1;
         ^~
cc1: all warnings being treated as errors

Standard output is empty