单链表的创建

typedef struct node
{
        int data;
        struct node *next;
}Node;

Node *createNode(void)
{
        Node *head=NULL;
        Node *p=NULL;
        Node *q=NULL;
        int i=0;
        int n=0;

        printf("\n请输入链表的长度：");
        scanf("%d",&n);

        if((head=(Node *)malloc(sizeof(Node)))==NULL)
        {
                printf("分配内存失败\n");
                exit(0);
        }
        head->data=n;
        head->next=NULL;
        p=head;
        printf("请输入这%d个整数,以q结束:\n",n);
        for(i=0; i        {
                if((q=(Node *)malloc(sizeof(Node)))==NULL)
                {
                        printf("分配内存失败\n");
                        exit(0);
                }
                scanf("%d\n",&(q->data));
                q->next=NULL;
                p->next=q;
                p=q;
        }
        p->next=NULL;
        return head;
}