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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5.  
  6. struct node
  7. {
  8. public:
  9.     int value;
  10.     node * left;
  11.     node * right;
  12. };
  13.  
  14.  
  15. class bTree
  16. {
  17. public:
  18.     node * root;
  19.  
  20. public:
  21.     bTree();
  22.     void insert(node *& r, int val);
  23.     void insert(int val);
  24.     void traversePreorder();
  25.     void traversePreorder(node * r);
  26.  
  27.  
  28. };
  29.  
  30. bTree::bTree()
  31. {
  32.     root = NULL;
  33. }
  34.  
  35. void bTree::insert(node *& r, int val)
  36. {
  37.     if (r == NULL)
  38.     {
  39.         r = new node();
  40.         r->value = val;
  41.         r->left = NULL;
  42.         r->right = NULL;
  43.         return;
  44.     }
  45.     else
  46.     {
  47.         if (val <= r->value)
  48.         {
  49.             insert(r->left, val);
  50.         }
  51.         else
  52.         {
  53.             insert(r->right, val);
  54.         }
  55.     }
  56. }
  57.  
  58. void bTree::insert(int val)
  59. {
  60.     insert(root, val);
  61. }
  62.  
  63. void bTree::traversePreorder(node * r)
  64. {
  65.     if (r == nullptr) 
  66.     {
  67.         return;
  68.     }
  69.     else
  70.     {
  71.         cout << r->value << " ";
  72.         traversePreorder(r->left);
  73.         traversePreorder(r->right);
  74.     }
  75. }
  76.  
  77. void bTree::traversePreorder()
  78. {
  79.     traversePreorder(root);
  80. }
  81.  
  82. int main()
  83. {
  84.     bTree * myTree = new bTree();
  85.  
  86.     myTree->insert(30);
  87.  
  88.     myTree->insert(40);
  89.     myTree->insert(20);
  90.     myTree->insert(10);
  91.     myTree->insert(50);
  92.  
  93.  
  94.     myTree->traversePreorder();
  95.  
  96.     return 0;
  97. }
Success #stdin #stdout 0s 3456KB
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stdout 
30 20 10 40 50
https://ideone.com/K4f36L
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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