21 `main' must return `int'
Build Error] ["arbol binario.o"] Error 1
ayuda no se q hacerle
Código C++:
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#include<iostream.h> #include<conio.h> #include<stdio.h> #include<stdlib.h> struct node { int data; node *left; node *right; }; node *tree=NULL; node *insert(node *tree,int ele); void preorder(node *tree); void inorder(node *tree); void postorder(node *tree); int count=1; void main() { int ch,ele; do { cout<<"\n\t\a\a1----INSERT A NODE IN A BINARY TREE.\a\a"; cout<<"\n\t\a\a2----PRE-ORDER TRAVERSAL.\a\a"; cout<<"\n\t\a\a3----IN-ORDER TRAVERSAL.\a\a"; cout<<"\n\t\a\a4----POST-ORDER TRAVERSAL.\a\a"; cout<<"\n\t\a\a5----EXIT.\a\a"; cout<<"\n\t\a\aENTER CHOICE::\a\a"; cin>>ch; switch(ch) { case 1: cout<<"\n\t\a\aENTER THE ELEMENT::\a\a"; cin>>ele; tree=insert(tree,ele); break; case 2: cout<<"\n\t\a\a****PRE-ORDER TRAVERSAL OF A TREE****\a\a"; preorder(tree); break; case 3: cout<<"\n\t\a\a****IN-ORDER TRAVERSAL OF A TREE****\a\a"; inorder(tree); break; case 4: cout<<"\n\t\a\a****POST-ORDER TRAVERSAL OF A TREE****\a\a"; postorder(tree); break; case 5: } }while(ch!=5); } node *insert(node *tree,int ele) { if(tree==NULL) { tree=new node; tree->left=tree->right=NULL; tree->data=ele; count++; } else if(count%2==0) tree->left=insert(tree->left,ele); else tree->right=insert(tree->right,ele); return(tree); } void preorder(node *tree) { if(tree!=NULL) { cout<<tree->data; preorder(tree->left); preorder(tree->right); } } void inorder(node *tree) { if(tree!=NULL) { inorder(tree->left); cout<<tree->data; inorder(tree->right); } } void postorder(node *tree) { if(tree!=NULL) { postorder(tree->left); postorder(tree->right); cout<<tree->data; } }