【C语言】单向链表 头插法

#include<stdio.h>
#include<stdlib.h>

int main()
{
    struct list{
        int num;
        struct list* prior;
    };

    char key;

    struct list *head = NULL;
    struct list *last = NULL;
    struct list *p = NULL;

    printf("do u want to write ur data?\n");
    scanf("%c", &key);
    while(key == 'y')
    {
    p = (struct list*)malloc(sizeof(struct list));
    if(!p)
        printf("no enough memory \n");
        
    printf("in out ur data\n");
    scanf("%d", &p->num);
    p->prior = NULL;
    if(head == NULL)
    {
        head = p;
        last = p;
    }
    else
    {
        p->prior = head;                               //新建节点的上一个节点指向头结点
        head = p;                                           //始终令新建节点为头结点
    }
    printf("\ndo u want to continue?\n");
    scanf(" %c", &key);
    
    }


while(head!= NULL)
{
    printf("%d", head->num);
    head = head->prior;
}

    return 0;
}