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  1. #include <string>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. struct Book {
  6.     string name;
  7. };
  8.  
  9. struct TreeNode {
  10.     float key;
  11.     Book book;
  12.     TreeNode* leftPtr;
  13.     TreeNode* rightPtr;
  14. };
  15. class MyTree {
  16.     TreeNode* rootPtr;
  17.     // this function crashes!
  18.     TreeNode* makeNode(float key,string bookName) {
  19.         TreeNode* newNode = new TreeNode;
  20.         if (newNode == NULL) {
  21.             cout << "Error: No more space";
  22.         }
  23.         else {
  24.             newNode->key = key;
  25.             cout << newNode->book.name << endl;
  26.             newNode->book.name = bookName;// CRASHES HERE
  27.             cout << "Name: " << newNode->book.name;
  28.             newNode->leftPtr = NULL;
  29.             newNode->rightPtr = NULL;
  30.         }
  31.         return newNode;
  32.     }
  33.     TreeNode* insert(TreeNode* nodePtr, float key, string bookName) {
  34.         if (nodePtr == NULL) {
  35.             nodePtr = makeNode(key, bookName);
  36.         }
  37.         else if (key < nodePtr->key) {
  38.             nodePtr->leftPtr = insert(nodePtr->leftPtr, key, bookName);
  39.         }
  40.         else if (key > nodePtr->key) {
  41.             nodePtr->rightPtr = insert(nodePtr->rightPtr, key, bookName);
  42.         }
  43.         else { cout << "Error: Key already exist. Cannot add node."; }
  44.         return nodePtr;
  45.     }
  46. public:
  47.     MyTree() { rootPtr = NULL; }
  48.     void addNode() {
  49.         // ask for input
  50.         float key = 0; string bookName = "default";
  51.         cout << "Enter a value for the key: ";
  52.         cin >> key;
  53.         cout << "Enter the name for the book: ";
  54.         cin >> bookName;
  55.  
  56.         // insert
  57.         rootPtr = insert(rootPtr, key, bookName);
  58.     }
  59. };
  60. int main() {
  61.     MyTree a;
  62.     a.addNode();
  63. }
Success #stdin #stdout 0s 15240KB
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42 zika
stdout
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Enter a value for the key: Enter the name for the book: 
Name: zika
https://ideone.com/TafL8T
language:
C++14 (clang 8.0)
created:
6 years ago
visibility:
public

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