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：C示例以反向显示双向链接列表
C示例以反向显示双向链接列表
#include <stdio.h> #include <stdlib.h> struct node { int data; struct node *prev; struct node *next; }; struct node *head = NULL; struct node *last = NULL; struct node *current = NULL; //display the list void printList() { struct node *ptr = head; printf("\n[head] <=>"); //start from the beginning while(ptr != NULL) { printf(" %d <=>",ptr->data); ptr = ptr->next; } printf(" [last]\n"); } //display the list void print_backward() { struct node *ptr = last; printf("\n[head] <=>"); //start from the beginning while(ptr != NULL) { printf(" %d <=>",ptr->data); ptr = ptr->prev; } printf(" [last]\n"); } //Create Linked List void insert(int data) { // Allocate memory for new node; struct node *link = (struct node*) malloc(sizeof(struct node)); link->data = data; link->prev = NULL; link->next = NULL; // If head is empty, create new list if(head==NULL) { head = link; return; } current = head; // move to the end of the list while(current->next!=NULL) current = current->next; // Insert link at the end of the list current->next = link; last = link; link->prev = current; } int main() { insert(10); insert(20); insert(30); insert(1); insert(40); insert(56); printList(); print_backward(); return 0; }
