InorderWithoutRecursion

#include <iostream>
#include <cstdio>

using namespace std;

struct tree{
    char data;
    struct tree *left;
    struct tree  *right;

};
 int index=-1;
typedef struct tree tree;
 tree *stack[100];
tree *insert(tree *root){

     char ch;

     printf("%c has any Left child: ", root->data);
        cin>>ch;
        if(ch == 'y'){
            root->left = new tree();
            cout<<"Enter left child\n";
            cin>>root->left->data;
            insert(root->left);
            }
        else
            root->left =NULL;

        printf("%c has any Right child:", root->data);
        cin>>ch;

        if(ch == 'y'){
            root->right = new tree();
            cout<<"Enter right child\n";
            cin>>root->right->data;
            insert(root->right);
            }
        else
            root->right = NULL;
return root;
}



void push(tree *x){

    index++;

    stack[index]  = x;

}
void pop(){

    index -=1;
}

tree *top(){


    return stack[index];
}

bool empty(){

    if(index <0)
        return true;

    return false;

}

void inorder(tree *root){
    tree *x;
    while(true){

        if(root !=NULL){

            push(root);
            root=root->left;

            }
        else{
            if(empty())
                break;
            x = top();
            cout<<x->data;
            pop();
            root = x->right;

            }


    }

}


int main(int argc, char **argv)
{


    tree *root;
    root = new tree();
    root->data = 'A';
    insert(root);
    inorder(root);




    return 0;
}