用c语言设计一个学生成绩管理系统

以下是一个用C语言设计的学生成绩管理系统的示例：

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

struct Student {
    int id;         // 学号
    char name[50];  // 姓名
    int mathGrade;  // 数学成绩
    int engGrade;   // 英语成绩
    int total;      // 总分
    float average;  // 平均分
    int rank;       // 名次
};

void addStudent(struct Student students[], int *count) {
    printf("请输入学生的学号：");
    scanf("%d", &students[*count].id);    printf("请输入学生的姓名：");
    scanf("%s", students[*count].name);
    printf("请输入学生的数学成绩：");
    scanf("%d", &students[*count].mathGrade);
    printf("请输入学生的英语成绩：");
    scanf("%d", &students[*count].engGrade);
    
    students[*count].total = students[*count].mathGrade + students[*count].engGrade;
    students[*count].average = (float)students[*count].total / 2;
    
    (*count)++;
    printf("学生信息添加成功！n");
}

void displayStudents(struct Student students[], int count) {
    printf("学号\t姓名\t数学成绩\t英语成绩\t总分\t平均分\t名次\n");
    for (int i = 0; i < count; i++) {
        printf("%d\t%s\t%d\t%d\t%d\t%.2f\t%d\n", students[i].id, students[i].name, students[i].mathGrade, students[i].engGrade, students[i].total, students[i].average, students[i].rank);
    }
}

void calculateRank(struct Student students[], int count) {
    for (int i = 0; i < count; i++) {
        students[i].rank = 1;
        for (int j = 0; j < count; j++) {
            if (students[j].total > students[i].total) {
                students[i].rank++;
            }
        }
    }
}

int main() {
    struct Student students[100];
    int count = 0;
    int select;
    
    while (1) {
        printf("学生成绩管理系统\n");
        printf("1. 添加学生记录\n");
        printf("2. 显示学生信息\n");
        printf("3. 计算名次\n");
        printf("0. 退出\n");
        printf("请选择操作：");
        scanf("%d", &select);
        
        switch (select) {
            case 1:
                addStudent(students, &count);
                break;
            case 2:
                displayStudents(students, count);
                break;
            case 3:
                calculateRank(students, count);
                printf("名次计算完成！\n");
                break;
            case 0:
                exit(0);
            default:
                printf("无效的选择！\n");
                break;
        }
    }
    
    return 0;
}