c语言编写一个学生信息管理系统

可以使用结构体来保存每个学生的信息，如下所示：

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

#define MAX_STUDENT_COUNT 100

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

int main() {
    Student students[MAX_STUDENT_COUNT];
    int student_count = 0;
    int choice = 0;
    
    while (1) {
        printf("1. 添加学生信息\n");
        printf("2. 查看学生信息\n");
        printf("3. 修改学生信息\n");
        printf("4. 删除学生信息\n");
        printf("5. 退出\n");
        printf("请输入你的选择: ");
        scanf("%d", &choice);
        
        switch (choice) {
            case 1: {
                if (student_count >= MAX_STUDENT_COUNT) {
                    printf("学生信息已满，无法添加新的学生！\n");
                    break;
                }
                
                printf("请输入学生姓名: ");
                scanf("%s", students[student_count].name);
                printf("请输入学生编号: ");
                scanf("%d", &students[student_count].id);
                printf("请输入学生年龄: ");
                scanf("%d", &students[student_count].age);
                printf("请输入学生成绩: ");
                scanf("%f", &students[student_count].score);
                
                student_count++;
                printf("学生信息已添加成功！\n");
                break;
            }
            case 2: {
                if (student_count == 0) {
                    printf("学生信息为空，无法查看学生信息！\n");
                    break;
                }
                
                printf("编号\t姓名\t年龄\t成绩\n");
                for (int i = 0; i < student_count; i++) {
                    printf("%d\t%s\t%d\t%.2f\n", students[i].id, students[i].name,
                           students[i].age, students[i].score);
                }
                
                break;
            }
            case 3: {
                if (student_count == 0) {
                    printf("学生信息为空，无法修改学生信息！\n");
                    break;
                }
                
                int id = 0;
                printf("请输入要修改的学生编号: ");
                scanf("%d", &id);
                
                int index = -1;
                for (int i = 0; i < student_count; i++) {
                    if (students[i].id == id) {
                        index = i;
                        break;
                    }
                }
                
                if (index == -1) {
                    printf("找不到学生信息，无法修改！\n");
                    break;
                }
                
                printf("当前信息为: %s\t%d\t%d\t%.2f\n", students[index].name,
                       students[index].id, students[index].age, students[index].score);
                printf("请输入新的学生姓名: ");
                scanf("%s", students[index].name);
                printf("请输入新的学生年龄: ");
                scanf("%d", &students[index].age);
                printf("请输入新的学生成绩: ");
                scanf("%f", &students[index].score);
                
                printf("学生信息已修改成功！\n");
                break;
            }
            case 4: {
                if (student_count == 0) {
                    printf("学生信息为空，无法删除学生信息！\n");
                    break;
                }
                
                int id = 0;
                printf("请输入要删除的学生编号: ");
                scanf("%d", &id);
                
                int index = -1;
                for (int i = 0; i < student_count; i++) {
                    if (students[i].id == id) {
                        index = i;
                        break;
                    }
                }
                
                if (index == -1) {
                    printf("找不到学生信息，无法删除！\n");
                    break;
                }
                
                for (int i = index; i < student_count - 1; i++) {
                    students[i] = students[i + 1];
                }
                
                student_count--;
                printf("学生信息已删除成功！\n");
                break;
            }
            case 5: {
                printf("感谢使用学生信息管理系统！\n");
                exit(0);
            }
            default: {
                printf("非法选择，请重新输入！\n");
                break;
            }
        }
    }
    
    return 0;
}