C code to implement Binary Tree

//C program to implement binary Tree//

#include<stdio.h>
#include<conio.h>
#include<alloc.h>
struct tree
{
    int data;
    struct tree *left,*right;
};
struct tree *nodecreate(int item)
{
     struct tree *t;
     t=(struct tree*)malloc(sizeof(struct tree));
     t->data=item;
     t->left=NULL;
     t->right=NULL;
     return(t);
}
void maketree(struct tree **node)
{
    char c;
    int element;
    struct tree *temp;
    if(*node==NULL)
    {
        printf("\nEnter the data ");
        scanf("%d",&element);
        temp=nodecreate(element);
        *node=temp;
    }
    printf("\nDo u want to create left child of %d (y/Y) ",(*node)->data);
    fflush(stdin);
    scanf("%c",&c);
    if(c=='y'||c=='Y')
        maketree(&(*node)->left);
    printf("\nDo u want to create right child of %d (y/Y) ",(*node)->data);
    fflush(stdin);
    scanf("%c",&c);
    if(c=='y'||c=='Y')
        maketree(&(*node)->right);
}
void preorder(struct tree *node)
{
    if(node!=NULL)
    {
    printf("%d ",node->data);
    preorder(node->left);
    preorder(node->right);
    }
}
void inorder(struct tree *node)
{
    if(node!=NULL)
    {
    inorder(node->left);
    printf("%d ",node->data);
    inorder(node->right);
    }
}
void postorder(struct tree *node)
{
    if(node!=NULL)
    {
    postorder(node->left);
    postorder(node->right);
    printf("%d ",node->data);
  //printf("%d ",node->data);
    }
}
void main()
{
struct tree *root;
char ch;
clrscr();
root=NULL;
printf("\nEnter y/Y for creating tree ");
fflush(stdin);
scanf("%c",&ch);
if(ch=='y'||ch=='Y')
{
    maketree(&root);
    printf("\nThe preorder traversal is\n");
    preorder(root);
    printf("\nThe postorder traversal is\n");
    postorder(root);
    printf("\nThe inorder traversal is\n");
    inorder(root);
}
getch();
}

/* Output of Binary Tree program */

Output of Binary Tree Program

Output of Binary Tree Program

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