代码如下：将信息录入后再次回到switch 语句，一直运行default，没法选择其他的选项，不知道是什么问题

Question

#include "stdio.h"
#include "stdlib.h"
#include "assert.h"


typedef struct student {
    char Name[20];
    int StuID;
    int Grade;
    
}stu;

//创建表
struct Node {
    struct student data;
    struct Node* next;
};

//创建表头
struct Node* createList() {
    struct Node* headNode = (struct Node*)malloc(sizeof(struct Node));
    assert(headNode);
    headNode->next = NULL;
    return headNode;
}

//创建结点
struct Node* createNode(struct student data) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    assert(newNode);
    newNode->data = data;
    newNode->next = NULL;
    return newNode;
}

//指定节点删除
void deleteAppointNodeByID(struct Node* headNode,int posID) {
    struct Node* posNode = headNode->next;
    struct Node* posFrontNode = headNode;
    if (posNode == NULL) {
        printf("数据为空，无法删除！\n");
        return;
    }
    while (posNode->data.StuID = posID) {
        posFrontNode = posNode;
        posNode = posFrontNode->next;
        if (posNode == NULL) {
            printf("未找到指定位置，无法删除！\n");
            return;
        }
    }
    posFrontNode->next = posNode->next;
    free(posNode);

}

//查找功能
struct Node* searchInfoByData(struct Node* headNode, int posData) {
    struct Node* posNode = headNode;
    while (posNode!=NULL) {
        if (posNode->data.StuID == posData)
            return posNode;
        posNode = posNode->next;
    }
    printf("无法找到结点\n");
    return NULL;
}


//插入结点
void insertNodeByHead(struct Node* headNode, struct student data) {
    struct Node* newNode = createNode(data);
    newNode->next = headNode->next;
    headNode->next = newNode;
}

//打印链表
void printList(struct Node* headNode) {
    struct Node* pMove = headNode->next;
    printf("Name\tStuID\tGrade");
    while (pMove) {
        printf("%s\t%d\t%d",pMove->data.Name,pMove->data.StuID,pMove->data.Grade);
        pMove = pMove->next;
    }
    printf("\n");
}

//建表


//按键交互
void keyDown() {
    struct Node* list = createList();
    struct student data;
    printf("请输入:(0`4)\n");
    switch (getchar()) {
    case '0':
        printf("正常退出！\n");
        system("pause");
        exit(0);
        break;
    case '1':
        printf("录入信息：\n");
        //插入链表
        printf("请输入学生姓名,学号，成绩\n");
        fflush(stdin);
        scanf_s("%s%d%d",data.Name,4,&data.StuID,&data.Grade);
        insertNodeByHead(list,data);
        break;
    case '2':
        printf("浏览信息：\n");
        printList(list);
        break;
    case '3':
        printf("删除信息：\n");
        break;
    case '4':

        printf("查找信息：\n");
        break;
    default:
        printf("输入错误，请重新输入！\n");
        break;
    }
}

//菜单
void menu() {
    printf("----------------------------\n");
    printf("学生信息管理系统\n");
    printf("1.录入信息\n");
    printf("2.浏览信息\n");
    printf("3.删除信息\n");
    printf("4.查找信息\n");
    printf("0.退出系统\n");
    printf("----------------------------\n");
}



int main() {


    while (1) {
        menu();
        keyDown();
        system("pause");
        system("cls");
    }
    system("pause");
    return 0;
}

Answer 1

case 0
case 1
不要用引号包括
望采纳