C语言：从表尾到到表头逆向创建链表，反转链表

偏执的太偏执、 2022-08-03 11:45 141阅读 0赞

/*
    	从表尾到到表头逆向创建链表，反转链表
    	逆向创建链表：新节点插入到头结点
    	反转链表：需要三个指针
    */
    
    # include <stdio.h>  
    # include <malloc.h>  
      
    //节点类型  
    typedef struct node  
    {  
        int data;  
        struct node * pNext;  
    }NODE, * PNODE;  
    
    PNODE converse_creat_list();  
    void traverse(PNODE pHead);
    PNODE converse(PNODE pHead);
    
    int main(void)  
    {  
        PNODE pHead = converse_creat_list();  //创建链表  
    
    	printf("建立链表：");
        traverse(pHead);  
    
    	//反转链表
    	printf("反转链表：");
    	PNODE pCon = converse(pHead);
    	traverse(pCon);  
    
    	return 0;
    }
    
    //创建链表  
    PNODE converse_creat_list()  
    {  
        int i;  
        int len, val;  
      
        printf("输入创建链表的长度：");  
        scanf("%d", &len);  
        PNODE pHead = (PNODE)malloc(sizeof(NODE));  //创建头结点  
        pHead->pNext = NULL;   
      
        PNODE pNew;  
      
        for(i = 0; i < len; i++)  
        {  
            printf("输入插入的第%d个元素 val:", len - i);  
            scanf("%d", &val);  
      
            pNew = (PNODE)malloc(sizeof(NODE));  //新节点  
            pNew->data = val; 
    		
            pNew->pNext = pHead->pNext;  //新节点插在头结点
            pHead->pNext = pNew;    
        }  
      
        return pHead;  
    }  
      
    //反转链表
    PNODE converse(PNODE pHead)
    {
    	PNODE p = pHead->pNext;
    
    	PNODE pCon = (PNODE)malloc(sizeof(NODE));  //新链表的头结点
    	pCon->pNext = NULL;
    
    	PNODE pMid = NULL;
    
    	PNODE pTail;
    
    	while(p)
    	{
    		pTail = pMid;
    		pMid = p;
    		p = p->pNext;
    		pMid->pNext = pTail;		
    	}
    	
    	pCon->pNext = pMid;
    
    	return pCon;
    }
    
    
    //遍历链表  
    void traverse(PNODE pHead)  
    {  
        PNODE p = pHead->pNext;  //指向首节点  
      
        while(p)  
        {  
            printf("%d ", p->data);  
            p = p->pNext;  
        }  
        printf("\n");  
    }

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