单链表的建立

#include <stdio.h>
#include <stdlib.h>
struct node
{
    int data;
    struct node *next;
};
typedef struct node LNode, *LinkList;

void CreateList(LinkList head);
void PrintList(LinkList head);
void ListDelete(LinkList head, int i, int *e);
void ListInsert(LinkList head, int i, int e);

int main()
{
    LinkList head;
    int i, e, select;

    head = (LinkList) malloc (sizeof(LNode));
    head -> next = NULL;

    while(1)
    {
        printf("1: Create a list.\n");
        printf("2: Insert some elements in the list.\n");
        printf("3: Delete some elements.\n");
        printf("4: Print the list.\n");
        printf("0: Quit!\n");
        scanf("%d", &select);

        switch(select)
        {
            case 1: CreateList(head); break;
            case 2: printf("Input position and name of the element.\n");
                    scanf("%d%d", &i, &e);
                    ListInsert(head, i, e);
                    break;
            case 3: printf("Input the position of the element.\n");
                    scanf("%d", &i);
                    ListDelete(head, i, &e);
            case 4: PrintList(head);
                    printf("\n");
                    break;
            case 0:
                    exit(0);
        }
    }
    return 0;
}

//void CreateList()//头插法
//{
//    LinkList p;
//    int num;
//
//    while(scanf("%d", &num), num!=-1)
//    {
//        p = (LinkList)malloc(sizeof(LNode));
//        p ->data = num;
//        p ->next = head ->next;
//        head ->next = p;
//    }
//}

void CreateList(LinkList head)//尾插法
{
    LinkList p, rear = head;
    int num;

    while(scanf("%d", &num), num!=-1)
    {
        p = (LinkList)malloc(sizeof(LNode));
        p ->data = num;
        rear ->next = p;
        rear = p;
    }
    rear ->next = NULL;
}

void PrintList(LinkList head)
{
    LinkList p = head ->next;

    while(p)
    {
        printf("%d\n", p ->data);
        p = p ->next;
    }
}

void ListInsert(LinkList head, int i, int e)//变相的头插法
{
    LinkList p, pre = head;
    int j = 0;

    while(pre && j<i+1)
    {
        pre = pre ->next;
        j++;
    }
    if(!pre || i<1)
    {
        printf("Input i error\n");
        return;
    }

    p = (LinkList)malloc(sizeof(LNode));
    p ->data = e;
    p ->next = pre->next;
    pre ->next = p;
}

void ListDelete(LinkList head, int i, int *e)
{
    LinkList p, pre;
    int j=0;
    while(pre && j<i-1)
    {
        pre = pre ->next;
        j++;
    }
    if(!pre || i<1)
    {
        printf("Input i error\n");
        return;
    }

    p = pre ->next;
    pre ->next = p ->next;
    *e = p->data;
    free(p);
}

  
 

  
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文章来源: recclay.blog.csdn.net，作者：ReCclay，版权归原作者所有，如需转载，请联系作者。

原文链接：recclay.blog.csdn.net/article/details/60953553