ErroR in Deleting of a node in Tree..

Hey Experts..!!
i try my best on tree while i am deleting a node from Tree..
it place remains same but value becomes 0..
Plz help me out from this situation
here code
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#include<conio.h>
#include<iostream.h>
struct node
{
int info;
node *left,*right,*parent;
};
node *root,*ntd;
void create()
{

	 node*par,*x;
	 par=NULL;
	 x=root;
	 ntd=new node;
	 cout<< " Enter a value";
	 cin>>ntd->info;
	  while(x!=NULL)
		{
		   par=x;

		  if(ntd->info < x->info)
			x=x->left;
		  else
			x=x->right;
		}

      ntd->parent=par;
      if(par==NULL)
	root=ntd;
     else if (ntd->info<par->info)
	par->left=ntd;
     else
	par->right=ntd;



}
void preorder(node *r)
{  if(r==NULL)
   return;
   cout<<" "<<r->info<<"\t";
 preorder(r->left);
 preorder(r->right);


}
node * min(node *m)
{
 while(m->left!=NULL)
	m=m->left;
    return m;

}
node * treesuc(node * s)
{
      return min(s->right);

}
void del(node *r,int num)
{      node *z,*y,*x,*ptr;
 while(r!=NULL)
	{
	 if(num==r->info)
	    {  ptr=r; break;}
	  else  if(num < r->info)
		r=r->left;
	   else
		r=r->right;
	}
       z=ptr;
  if(z->left==NULL || z->right==NULL)
	y=z;
  else y=treesuc(z);


  if(y->left!=NULL)
	x=y->left;

  else
	x=y->right;

  if(x!=NULL)
	x->parent=y->parent;
  if(y->parent=NULL)
	root=x;
  else if(y=y->parent->left)
	y->parent->left=x;
  else
	y->parent->right=x;
  if(y!=z)
	z->info=y->info;



}

void main()
{
 clrscr();
 root=NULL;
 int nu;
 create();
// preorder(root);
 for(int i=1;i<=5;i++)
 create();
 preorder(root);
 cout<<"\nEnter a number to del from tree";
 cin>>nu;
 del(root,nu);
 preorder(root);
 create();
 preorder(root);
 getch();


}
Probably the first thing to do is to start paying attention to the warnings generated by your compiler.

To compare two variables we use ==. main returns int. Use #include <iostream> instead of <iostream.h>.
i am using Turbo c...
here we write
#include <iostream>
== where to add line number
Line 88:

else if(y=y->parent->left)

All the best,
NwN
thanks
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