学生成绩管理系统设计c语言

以下是一个简单的学生成绩管理系统的C语言实现，包括学生信息的输入、输出、查询、排序、删除、统计和退出等功能。具体实现如下：

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

#define MAX_STUDENT_NUM 100 // 最大学生数
#define MAX_NAME_LEN 20 // 最大姓名长度
#define MAX_SUBJECT_NUM 5 // 最大科目数

// 学生结构体
typedef struct {
    char name[MAX_NAME_LEN]; // 姓名
    int id; // 学号
    float scores[MAX_SUBJECT_NUM]; // 各科成绩
    float avg_score; // 平均成绩
} Student;

// 学生数组
Student students[MAX_STUDENT_NUM];
int student_num = 0; // 学生数

// 显示菜单
void show_menu() {
    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. 按平均成绩排序\n");
    printf("5. 删除学生信息\n");
    printf("6. 统计学生信息\n");
    printf("7. 退出\n");
}

// 添加学生信息
void add_student() {
    if (student_num >= MAX_STUDENT_NUM) {
        printf("学生数已达到最大值，无法添加新学生！\n");
        return;
    }
    Student student;
    printf("请输入学生姓名：");
    scanf("%s", student.name);
    printf("请输入学生学号：");
    scanf("%d", &student.id);
    printf("请输入学生各科成绩：");
    for (int i = 0; i < MAX_SUBJECT_NUM; i++) {
        scanf("%f", &student.scores[i]);
    }
    // 计算平均成绩
    float sum = 0;
    for (int i = 0; i < MAX_SUBJECT_NUM; i++) {
        sum += student.scores[i];
    }
    student.avg_score = sum / MAX_SUBJECT_NUM;
    students[student_num++] = student;
    printf("添加成功！\n");
}

// 显示所有学生信息
void show_all_students() {
    if (student_num == 0) {
        printf("没有学生信息！\n");
        return;
    }
    printf("姓名\t学号\t语文\t数学\t英语\t物理\t化学\t平均成绩\n");
    for (int i = 0; i < student_num; i++) {
        printf("%s\t%d\t", students[i].name, students[i].id);
        for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
            printf("%.1f\t", students[i].scores[j]);
        }
        printf("%.1f\n", students[i].avg_score);
    }
}

// 查询学生信息
void search_student() {
    if (student_num == 0) {
        printf("没有学生信息！\n");
        return;
    }
    int id;
    printf("请输入要查询的学生学号：");
    scanf("%d", &id);
    for (int i = 0; i < student_num; i++) {
        if (students[i].id == id) {
            printf("姓名\t学号\t语文\t数学\t英语\t物理\t化学\t平均成绩\n");
            printf("%s\t%d\t", students[i].name, students[i].id);
            for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
                printf("%.1f\t", students[i].scores[j]);
            }
            printf("%.1f\n", students[i].avg_score);
            return;
        }
    }
    printf("没有找到该学生！\n");
}

// 按平均成绩排序
void sort_by_avg_score() {
    if (student_num == 0) {
        printf("没有学生信息！\n");
        return;
    }
    // 冒泡排序
    for (int i = 0; i < student_num - 1; i++) {
        for (int j = 0; j < student_num - i - 1; j++) {
            if (students[j].avg_score < students[j + 1].avg_score) {
                Student temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }
    printf("排序成功！\n");
}

// 删除学生信息
void delete_student() {
    if (student_num == 0) {
        printf("没有学生信息！\n");
        return;
    }
    int id;
    printf("请输入要删除的学生学号：");
    scanf("%d", &id);
    for (int i = 0; i < student_num; i++) {
        if (students[i].id == id) {
            for (int j = i; j < student_num - 1; j++) {
                students[j] = students[j + 1];
            }
            student_num--;
            printf("删除成功！\n");
            return;
        }
    }
    printf("没有找到该学生！\n");
}

// 统计学生信息
void count_student() {
    if (student_num == 0) {
        printf("没有学生信息！\n");
        return;
    }
    float sum[MAX_SUBJECT_NUM] = {0};
    float avg[MAX_SUBJECT_NUM] = {0};
    float max_score[MAX_SUBJECT_NUM] = {0};
    float min_score[MAX_SUBJECT_NUM] = {100};
    for (int i = 0; i < student_num; i++) {
        for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
            sum[j] += students[i].scores[j];
            if (students[i].scores[j] > max_score[j]) {
                max_score[j] = students[i].scores[j];
            }
            if (students[i].scores[j] < min_score[j]) {
                min_score[j] = students[i].scores[j];
            }
        }
    }
    for (int i = 0; i < MAX_SUBJECT_NUM; i++) {
        avg[i] = sum[i] / student_num;
    }
    printf("科目\t平均分\t最高分\t最低分\n");
    printf("语文\t%.1f\t%.1f\t%.1f\n", avg[0], max_score[0], min_score[0]);
    printf("数学\t%.1f\t%.1f\t%.1f\n", avg[1], max_score[1], min_score[1]);
    printf("英语\t%.1f\t%.1f\t%.1f\n", avg[2], max_score[2], min_score[2]);
    printf("物理\t%.1f\t%.1f\t%.1f\n", avg[3], max_score[3], min_score[3]);
    printf("化学\t%.1f\t%.1f\t%.1f\n", avg[4], max_score[4], min_score[4]);
}

int main() {
    int choice;
    while (1) {
        show_menu();
        printf("请输入操作编号：");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                show_all_students();
                break;
            case 3:
                search_student();
                break;
            case 4:
                sort_by_avg_score();
                break;
            case 5:
                delete_student();
                break;
            case 6:
                count_student();
                break;
            case 7:
                printf("谢谢使用！\n");
                exit(0);
            default:
                printf("无效的操作编号！\n");
                break;
        }
    }
    return 0;
}