二十五岁时我们都一样愚蠢、多愁善感，喜欢故弄玄虚，可如果不那样的话，五十岁时也就不会如此明智。
标题：数据结构树遍历
数据结构树遍历
#include <stdio.h> #include <stdlib.h> struct node { int data; struct node *leftChild; struct node *rightChild; }; struct node *root = NULL; void insert(int data) { struct node *tempNode = (struct node*) malloc(sizeof(struct node)); struct node *current; struct node *parent; tempNode->data = data; tempNode->leftChild = NULL; tempNode->rightChild = NULL; //if tree is empty if(root == NULL) { root = tempNode; } else { current = root; parent = NULL; while(1) { parent = current; //go to left of the tree if(data < parent->data) { current = current->leftChild; //insert to the left if(current == NULL) { parent->leftChild = tempNode; return; } } //go to right of the tree else { current = current->rightChild; //insert to the right if(current == NULL) { parent->rightChild = tempNode; return; } } } } } struct node* search(int data) { struct node *current = root; printf("Visiting elements: "); while(current->data != data) { if(current != NULL) printf("%d ",current->data); //go to left tree if(current->data > data) { current = current->leftChild; } //else go to right tree else { current = current->rightChild; } //not found if(current == NULL) { return NULL; } } return current; } void pre_order_traversal(struct node* root) { if(root != NULL) { printf("%d ",root->data); pre_order_traversal(root->leftChild); pre_order_traversal(root->rightChild); } } void inorder_traversal(struct node* root) { if(root != NULL) { inorder_traversal(root->leftChild); printf("%d ",root->data); inorder_traversal(root->rightChild); } } void post_order_traversal(struct node* root) { if(root != NULL) { post_order_traversal(root->leftChild); post_order_traversal(root->rightChild); printf("%d ", root->data); } } int main() { int i; int array[7] = { 27, 14, 35, 10, 19, 31, 42 }; for(i = 0; i < 7; i++) insert(array[i]); i = 31; struct node * temp = search(i); if(temp != NULL) { printf("[%d] Element found.", temp->data); printf("\n"); }else { printf("[ x ] Element not found (%d).\n", i); } i = 15; temp = search(i); if(temp != NULL) { printf("[%d] Element found.", temp->data); printf("\n"); }else { printf("[ x ] Element not found (%d).\n", i); } printf("\nPreorder traversal: "); pre_order_traversal(root); printf("\nInorder traversal: "); inorder_traversal(root); printf("\nPost order traversal: "); post_order_traversal(root); return 0; }
