主要内容：该系统实现对学生成绩的批量录入、修改、查询、浏览等功能。具体要求如下： 学生信息包括：学号、姓名、入学年月、4门课的成绩等8个成员，试设计学生成绩管理系统，使之能提供以下功能： 1、信息录入：录入每一位学生信息（包括学号、姓名、入学年月和4门课的成绩）； 2、信息浏览：输出系统内所有学生的信息； 3、成绩修改：输入学号，修改该生某一门课的成绩； 4、分类查询：按学号或姓名查找学生，输出学生的成绩单； 5、统计学生总成绩：计算每个学生的总分及平均分，并根据学生的平均成绩进行排序；6、统计每门课程的成绩：计算每一门课程学生的及格率、优秀率等。 的c语言代码

以下是一个简单的学生成绩管理系统的C语言代码实现：

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

#define MAX_STUDENTS 100
#define MAX_NAME_LEN 20

typedef struct {
    char id[10];
    char name[MAX_NAME_LEN];
    char start_date[10];
    int scores[4];
    int total_score;
    float ave_score;
} Student;

typedef struct {
    Student students[MAX_STUDENTS];
    int count;
} StudentManager;

void init(StudentManager *manager) {
    manager->count = 0;
}

void add(StudentManager *manager, Student student) {
    manager->students[manager->count++] = student;
}

void print_header() {
    printf("%5s %-10s %-10s %4s %4s %4s %4s %6s %6s\n", "No.", "ID", "Name", "Course1", "Course2", "Course3", "Course4", "Total", "Average");
}

void print_student(Student student, int index) {
    printf("%5d %-10s %-10s %4d %4d %4d %4d %6d %6.2f\n", index, student.id, student.name, student.scores[0], student.scores[1], student.scores[2], student.scores[3], student.total_score, student.ave_score);
}

void print(StudentManager manager) {
    print_header();
    for (int i = 0; i < manager.count; i++) {
        print_student(manager.students[i], i+1);
    }
}

int find(StudentManager manager, char *key) {
    for (int i = 0; i < manager.count; i++) {
        if (strcmp(manager.students[i].id, key) == 0 || strcmp(manager.students[i].name, key) == 0) {
            return i;
        }
    }
    return -1;
}

void update(StudentManager *manager, char *id, int course, int score) {
    int index = find(*manager, id);
    if (index == -1) {
        printf("Student not found.\n");
    } else {
        manager->students[index].scores[course-1] = score;
        int total_score = 0;
        for (int i = 0; i < 4; i++) {
            total_score += manager->students[index].scores[i];
        }
        manager->students[index].total_score = total_score;
        manager->students[index].ave_score = total_score / 4.0;
        printf("Score updated.\n");
    }
}

void sort(StudentManager *manager) {
    for (int i = 0; i < manager->count-1; i++) {
        for (int j = 0; j < manager->count-1-i; j++) {
            if (manager->students[j].ave_score < manager->students[j+1].ave_score) {
                Student temp = manager->students[j];
                manager->students[j] = manager->students[j+1];
                manager->students[j+1] = temp;
            }
        }
    }
}

void print_course_stats(StudentManager manager, int course) {
    int pass_count = 0, excellent_count = 0;
    for (int i = 0; i < manager.count; i++) {
        if (manager.students[i].scores[course-1] >= 60) {
            pass_count++;
        }
        if (manager.students[i].scores[course-1] >= 90) {
            excellent_count++;
        }
    }
    printf("Course %d statistics: pass rate=%.2f%%, excellent rate=%.2f%%\n", course, pass_count*100.0/manager.count, excellent_count*100.0/manager.count);
}

int main() {
    StudentManager manager;
    init(&manager);

    while (1) {
        printf("\nStudent Score Management System\n");
        printf("1. Add Student\n");
        printf("2. View Students\n");
        printf("3. Update Score\n");
        printf("4. Find Student\n");
        printf("5. Sort Students\n");
        printf("6. Course Statistics\n");
        printf("0. Exit\n");
        printf("Enter your choice: ");
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 0:
                printf("Goodbye!\n");
                exit(0);
            case 1:
                printf("Enter student ID: ");
                char id[10];
                scanf("%s", id);
                printf("Enter student name: ");
                char name[MAX_NAME_LEN];
                scanf("%s", name);
                printf("Enter start date (YYYY-MM-DD): ");
                char start_date[10];
                scanf("%s", start_date);
                printf("Enter scores for 4 courses: ");
                int scores[4];
                for (int i = 0; i < 4; i++) {
                    scanf("%d", &scores[i]);
                }
                Student student = {0};
                strcpy(student.id, id);
                strcpy(student.name, name);
                strcpy(student.start_date, start_date);
                for (int i = 0; i < 4; i++) {
                    student.scores[i] = scores[i];
                    student.total_score += scores[i];
                }
                student.ave_score = student.total_score / 4.0;
                add(&manager, student);
                printf("Student added.\n");
                break;
            case 2:
                print(manager);
                break;
            case 3:
                printf("Enter student ID: ");
                scanf("%s", id);
                printf("Enter course number (1-4): ");
                int course;
                scanf("%d", &course);
                printf("Enter new score: ");
                int score;
                scanf("%d", &score);
                update(&manager, id, course, score);
                break;
            case 4:
                printf("Enter student ID or name: ");
                char key[20];
                scanf("%s", key);
                int index = find(manager, key);
                if (index == -1) {
                    printf("Student not found.\n");
                } else {
                    print_header();
                    print_student(manager.students[index], 1);
                }
                break;
            case 5:
                sort(&manager);
                printf("Students sorted by average score.\n");
                print(manager);
                break;
            case 6:
                printf("Enter course number (1-4): ");
                scanf("%d", &course);
                print_course_stats(manager, course);
                break;
            default:
                printf("Invalid choice.\n");
                break;
        }
    }
    return 0;
}

以上代码实现了一个简单的学生成绩管理系统，包括信息录入、信息浏览、成绩修改、分类查询、统计学生总成绩和每门课程的成绩等功能。其中采用了结构体存储学生信息，采用函数实现各种操作，以及采用排序算法对学生进行排序等。