c语言课程设计学生成绩管理系统作业

好的，那么你需要一个学生成绩管理系统，下面是一个简单的设计思路：

1. 首先需要创建一个学生信息结构体，包括学生姓名、学号、班级等信息。
2. 创建一个成绩信息结构体，包括各科成绩、总成绩等信息。
3. 使用动态数组或链表来存储学生信息和成绩信息。
4. 实现添加、删除、修改、查询学生信息和成绩信息的功能。
5. 实现成绩计算功能，包括平均分、总分、排名等。
6. 可以将学生信息和成绩信息存储到文件中，以便下次启动程序时可以读取之前保存的数据。

下面是一个简单的代码示例，供参考：

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

#define MAX_NAME_LEN 20
#define MAX_CLASS_LEN 10
#define MAX_STUDENT_NUM 100

// 学生信息结构体
typedef struct {
    char name[MAX_NAME_LEN];
    char id[MAX_CLASS_LEN];
    char class[MAX_CLASS_LEN];
} StudentInfo;

// 成绩信息结构体
typedef struct {
    double score1;
    double score2;
    double score3;
    double total_score;
    int rank;
} ScoreInfo;

// 学生及成绩信息结构体
typedef struct {
    StudentInfo student;
    ScoreInfo score;
} StudentScoreInfo;

// 全局变量，用于存储所有学生及成绩信息
StudentScoreInfo g_students[MAX_STUDENT_NUM];
int g_student_num = 0;

// 添加学生信息
void add_student() {
    printf("Please input student info:\n");
    printf("Name: ");
    scanf("%s", g_students[g_student_num].student.name);
    printf("ID: ");
    scanf("%s", g_students[g_student_num].student.id);
    printf("Class: ");
    scanf("%s", g_students[g_student_num].student.class);
    printf("Score1: ");
    scanf("%lf", &g_students[g_student_num].score.score1);
    printf("Score2: ");
    scanf("%lf", &g_students[g_student_num].score.score2);
    printf("Score3: ");
    scanf("%lf", &g_students[g_student_num].score.score3);
    g_students[g_student_num].score.total_score = g_students[g_student_num].score.score1 + g_students[g_student_num].score.score2 + g_students[g_student_num].score.score3;
    g_student_num++;
    printf("Add student success!\n");
}

// 删除学生信息
void delete_student() {
    char id[MAX_CLASS_LEN];
    printf("Please input id of student you want to delete:\n");
    scanf("%s", id);
    for (int i = 0; i < g_student_num; i++) {
        if (strcmp(id, g_students[i].student.id) == 0) {
            for (int j = i + 1; j < g_student_num; j++) {
                g_students[j - 1] = g_students[j];
            }
            g_student_num--;
            printf("Delete student success!\n");
            return;
        }
    }
    printf("Student not found!\n");
}

// 修改学生信息
void modify_student() {
    char id[MAX_CLASS_LEN];
    printf("Please input id of student you want to modify:\n");
    scanf("%s", id);
    for (int i = 0; i < g_student_num; i++) {
        if (strcmp(id, g_students[i].student.id) == 0) {
            printf("Please input new student info:\n");
            printf("Name: ");
            scanf("%s", g_students[i].student.name);
            printf("ID: ");
            scanf("%s", g_students[i].student.id);
            printf("Class: ");
            scanf("%s", g_students[i].student.class);
            printf("Score1: ");
            scanf("%lf", &g_students[i].score.score1);
            printf("Score2: ");
            scanf("%lf", &g_students[i].score.score2);
            printf("Score3: ");
            scanf("%lf", &g_students[i].score.score3);
            g_students[i].score.total_score = g_students[i].score.score1 + g_students[i].score.score2 + g_students[i].score.score3;
            printf("Modify student success!\n");
            return;
        }
    }
    printf("Student not found!\n");
}

// 查询学生信息
void query_student() {
    char id[MAX_CLASS_LEN];
    printf("Please input id of student you want to query:\n");
    scanf("%s", id);
    for (int i = 0; i < g_student_num; i++) {
        if (strcmp(id, g_students[i].student.id) == 0) {
            printf("Name: %s\n", g_students[i].student.name);
            printf("ID: %s\n", g_students[i].student.id);
            printf("Class: %s\n", g_students[i].student.class);
            printf("Score1: %.2lf\n", g_students[i].score.score1);
            printf("Score2: %.2lf\n", g_students[i].score.score2);
            printf("Score3: %.2lf\n", g_students[i].score.score3);
            printf("Total score: %.2lf\n", g_students[i].score.total_score);
            printf("Rank: %d\n", g_students[i].score.rank);
            return;
        }
    }
    printf("Student not found!\n");
}

// 计算成绩
void calculate_score() {
    // 计算总分
    for (int i = 0; i < g_student_num; i++) {
        g_students[i].score.total_score = g_students[i].score.score1 + g_students[i].score.score2 + g_students[i].score.score3;
    }
    // 计算排名
    for (int i = 0; i < g_student_num; i++) {
        g_students[i].score.rank = 1;
        for (int j = 0; j < g_student_num; j++) {
            if (g_students[j].score.total_score > g_students[i].score.total_score) {
                g_students[i].score.rank++;
            }
        }
    }
    printf("Calculate score success!\n");
}

// 显示菜单
void show_menu() {
    printf("Please select an operation:\n");
    printf("1. Add student\n");
    printf("2. Delete student\n");
    printf("3. Modify student\n");
    printf("4. Query student\n");
    printf("5. Calculate score\n");
    printf("6. Exit\n");
}

int main() {
    int choice = 0;
    while (1) {
        show_menu();
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                delete_student();
                break;
            case 3:
                modify_student();
                break;
            case 4:
                query_student();
                break;
            case 5:
                calculate_score();
                break;
            case 6:
                exit(0);
            default:
                printf("Invalid choice!\n");
                break;
        }
    }
    return 0;
}

这只是一个简单的设计，你可以根据实际需求来增加或修改功能。同时，也可以根据具体情况来选择使用动态数组还是链表来存储数据。