求c语言大佬拯救刚学c的萌新

望采纳

#include <stdio.h>
#include <string.h>

#define MAX_STUDENTS 100

typedef struct {
    char name[50];
    int age;
    int grade;
    int id;
} Student;

void addStudent(Student *students, int *num_students);
void displayStudents(const Student *students, int num_students);
void searchStudent(const Student *students, int num_students);
void modifyStudent(Student *students, int num_students);

int main() {
    Student students[MAX_STUDENTS];
    int num_students = 0;
    int choice;

    do {
        printf("\n学生管理系统\n");
        printf("1. 添加学生信息\n");
        printf("2. 显示所有学生信息\n");
        printf("3. 查询学生信息\n");
        printf("4. 修改学生信息\n");
        printf("0. 退出\n");
        printf("请输入你的选择：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addStudent(students, &num_students);
                break;
            case 2:
                displayStudents(students, num_students);
                break;
            case 3:
                searchStudent(students, num_students);
                break;
            case 4:
                modifyStudent(students, num_students);
                break;
            case 0:
                printf("谢谢使用，再见！\n");
                break;
            default:
                printf("无效的选项，请重新输入！\n");
        }
    } while (choice != 0);

    return 0;
}

void addStudent(Student *students, int *num_students) {
    if (*num_students >= MAX_STUDENTS) {
        printf("学生数量已达上限，无法添加新学生！\n");
        return;
    }

    printf("请输入学生姓名：");
    scanf("%s", students[*num_students].name);
    printf("请输入学生年龄：");
    scanf("%d", &students[*num_students].age);
    printf("请输入学生年级：");
    scanf("%d", &students[*num_students].grade);
    printf("请输入学生ID：");
    scanf("%d", &students[*num_students].id);
    (*num_students)++;
    printf("学生信息已添加成功！\n");
}

void displayStudents(const Student *students, int num_students) {
    printf("\n学生信息: \n");
    for (int i = 0; i < num_students; i++) {
        printf("\t姓名：%s\n\t年龄：%d\n\t年级：%d\n\tID：%d\n", students[i].name, students[i].age, students[i].grade, students[i].id);
    }
}

void searchStudent(const Student *students, int num_students) {
    int id;
    printf("请输入要查询的学生ID: ");
    scanf("%d", &id);

    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            printf("查询结果：\n");
            printf("\t姓名：%s\n\t年龄：%d\n\t年级：%d\n\tID：%d\n", students[i].name, students[i].age, students[i].grade, students[i].id);
            return;
        }
    }
    printf("未找到ID为%d的学生信息。\n", id);
}
void modifyStudent(Student *students, int num_students) {
    int id;
    printf("请输入要修改的学生ID：");
    scanf("%d", &id);
    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            printf("当前学生信息：\n");
            printf("\t姓名：%s\n\t年龄：%d\n\t年级：%d\n\tID：%d\n", students[i].name, students[i].age, students[i].grade, students[i].id);
            printf("请输入新的学生姓名：");
            scanf("%s", students[i].name);
            printf("请输入新的学生年龄：");
            scanf("%d", &students[i].age);
            printf("请输入新的学生年级：");
            scanf("%d", &students[i].grade);
            printf("学生信息已修改成功！\n");
            return;
        }
    }
    printf("未找到ID为%d的学生信息。\n", id);
}