作业 - 链表打印
main.m
1 #import <Foundation/Foundation.h> 2 3 typedef struct Node_{ // 别名: Node 4 int value; 5 struct Node_ *next; 6 }Node; 7 8 Node *creatNode(int value, Node *next){ // 函数: 创建单个链节 9 Node *node = malloc(sizeof(Node)); 10 node -> value = value; 11 node -> next = NULL; 12 return node; 13 } 14 15 void printlist(Node *head){ // 函数: 打印整个链表 16 for(Node *node = head;node != NULL; node = node->next){ 17 printf("%d\n",node -> value); 18 } 19 } 20 21 void reverselist(Node *head){ // 函数: 反转链表并打印 22 23 printf("reversed:\n"); 24 25 if (head -> next == NULL) { // 如果是单链节的链表就不用反转 26 return; 27 } 28 29 Node *a; 30 Node *b; 31 Node *c; 32 33 a = head; 34 b = head -> next; 35 head -> next = NULL; 36 c = b -> next; 37 38 while (c) { 39 b -> next = a; 40 a = b; 41 b = c; 42 c = c -> next; 43 } 44 45 b -> next = a; // 处理剩余的最后一个链节 46 printlist(b); // 此时链节起点是 b 47 } 48 49 int main(int argc, const char * argv[]) { 50 @autoreleasepool { 51 52 Node *current = creatNode(0, NULL); 53 Node *head = current; // 创建起始端点 54 55 for (int i=1; i<=9 ; i++) { // 创建余下链节 56 current -> next = creatNode(i, NULL); 57 current = current->next; 58 } 59 60 printlist(head); // 调用打印函数 61 reverselist(head); // 调用反转并打印函数 62 } 63 return 0; 64 }
