学生管理系统c语言版0

以下是一个简单的学生信息管理系统的C语言代码示例：

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

#define MAX_STUDENTS 100

typedef struct {
    char num[10];
    char name[20];
    int age;
    float score;
} Student;

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

    while (1) {
        printf("请选择操作：\n");
        printf("1. 添加学生信息\n");
        printf("2. 查询学生信息\n");
        printf("3. 修改学生信息\n");
        printf("4. 删除学生信息\n");
        printf("5. 显示所有学生信息\n");
        printf("0. 退出\n");

        int choice;
        scanf("%d", &choice);

        switch (choice) {
            case 1: {
                if (count >= MAX_STUDENTS) {
                    printf("学生信息已满，无法添加！\n");
                    break;
                }

                printf("请输入学号：");
                scanf("%s", students[count].num);
                printf("请输入姓名：");
                scanf("%s", students[count].name);
                printf("请输入年龄：");
                scanf("%d", &students[count].age);
                printf("请输入成绩：");
                scanf("%f", &students[count].score);

                count++;
                printf("学生信息添加成功！\n");
                break;
            }
            case 2: {
                char num[10];
                printf("请输入要查询的学号：");
                scanf("%s", num);

                int found = 0;
                for (int i = 0; i < count; i++) {
                    if (strcmp(students[i].num, num) == 0) {
                        printf("学号：%s\n", students[i].num);
                        printf("姓名：%s\n", students[i].name);
                        printf("年龄：%d\n", students[i].age);
                        printf("成绩：%.2f\n", students[i].score);
                        found = 1;
                        break;
                    }
                }

                if (!found) {
                    printf("未找到该学号对应的学生信息！\n");
                }
                break;
            }
            case 3: {
                char num[10];
                printf("请输入要修改的学号：");
                scanf("%s", num);

                int found = 0;
                for (int i = 0; i < count; i++) {
                    if (strcmp(students[i].num, num) == 0) {
                        printf("请输入新的姓名：");
                        scanf("%s", students[i].name);
                        printf("请输入新的年龄：");
                        scanf("%d", &students[i].age);
                        printf("请输入新的成绩：");
                        scanf("%f", &students[i].score);
                        found = 1;
                        printf("学生信息修改成功！\n");
                        break;
                    }
                }

                if (!found) {
                    printf("未找到该学号对应的学生信息！\n");
                }
                break;
            }
            case 4: {
                char num[10];
                printf("请输入要删除的学号：");
                scanf("%s", num);

                int found = 0;
                for (int i = 0; i < count; i++) {
                    if (strcmp(students[i].num, num) == 0) {
                        for (int j = i; j < count - 1; j++) {
                            students[j] = students[j + 1];
                        }
                        count--;
                        found = 1;
                        printf("学生信息删除成功！\n");
                        break;
                    }
                }

                if (!found) {
                    printf("未找到该学号对应的学生信息！\n");
                }
                break;
            }
            case 5: {
                if (count == 0) {
                    printf("暂无学生信息！\n");
                    break;
                }

                printf("所有学生信息如下：\n");
                for (int i = 0; i < count; i++) {
                    printf("学号：%s\n", students[i].num);
                    printf("姓名：%s\n", students[i].name);
                    printf("年龄：%d\n", students[i].age);
                    printf("成绩：%.2f\n", students[i].score);
                    printf("\n");
                }
                break;
            }
            case 0: {
                printf("感谢使用学生信息管理系统，再见！\n");
                return 0;
            }
            default:
                printf("无效的操作！\n");
                break;
        }
    }
}