链表的创建,结点的插入,以及链表的打印删除等,这可以相当于一个模板记下来!

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#include <stdio.h>
#include<malloc.h>

struct Node {
    int val;
    struct Node* next;

};

//创建
struct Node* createNode(int val) {
    struct Node* p = NULL;
    p = (struct Node*)malloc(sizeof(struct Node));
    if (p == NULL) {
        printf("创建失败!\n");
        return NULL;
    }
    p->val = val; //f赋值
    p->next = NULL;
    return p;
}

//插入
void insertNode(struct Node* q, int val) {
    struct Node *p;
       p = (struct Node*)malloc(sizeof(struct Node));
         if (p == NULL) {
        printf("创建失败!\n");
        return ;
    }
    p->val=val;
    p->next=q->next;
    q->next=p;
}


//打印
void printfNode(struct Node* p)
{
     struct Node* head =p;
     while(head->next!=NULL)
     {
         printf("%d ",head->val);
         head=head->next;
     }
}

int main() {
    int n, i;
    scanf("%d", &n);
    int *arr=(int *)malloc(sizeof(int)*n);
    struct Node* head = createNode(0); //创建链表
    struct Node* p = head;

    for(i=0;i<n;i++)
    scanf("%d",&arr[i]);

    head->val=arr[0];
    for (i = 1; i <=n; i++) {
        insertNode(p, arr[i]);
        p = p->next;
    }
    printfNode(head);

    free(p);
    return 0;
}
//删除的操作
void deleteNode(struct Node* head ,int data)  //data为要删除的结点数
{
    struct Node* p=head;
    struct Node* q=NULL;
    while(p!=NULL)
    {
        if(p->val==data)
        {
            if(p==head)  //要删除的是头结点
            head=p->next;
            else
            q->next=p->next;
        }
        q=p;  //备份
        p=p->next;
    }
}