请运用c语言编写出来这套系统

好的，下面是一个简单的学生成绩管理系统的C语言代码，包含菜单驱动和上述功能的实现：

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

#define MAX_STUDENTS 100
#define MAX_COURSES 10
#define MAX_NAME_LEN 20
#define MAX_ID_LEN 10

struct Student {
    char id[MAX_ID_LEN];
    char name[MAX_NAME_LEN];
    float scores[MAX_COURSES];
    float total_score;
    float avg_score;
};

struct Student students[MAX_STUDENTS];
int num_students = 0;
int num_courses = 0;

void add_student() {
    if (num_students >= MAX_STUDENTS) {
        printf("Maximum number of students reached.\n");
        return;
    }
    struct Student s;
    printf("Enter student id: ");
    scanf("%s", s.id);
    printf("Enter student name: ");
    scanf("%s", s.name);
    for (int i = 0; i < num_courses; i++) {
        printf("Enter score for course %d: ", i+1);
        scanf("%f", &s.scores[i]);
        s.total_score += s.scores[i];
    }
    s.avg_score = s.total_score / num_courses;
    students[num_students++] = s;
    printf("Student added successfully.\n");
}

void modify_student() {
    char id[MAX_ID_LEN];
    printf("Enter student id to modify: ");
    scanf("%s", id);
    for (int i = 0; i < num_students; i++) {
        if (strcmp(students[i].id, id) == 0) {
            printf("Enter new student id: ");
            scanf("%s", students[i].id);
            printf("Enter new student name: ");
            scanf("%s", students[i].name);
            for (int j = 0; j < num_courses; j++) {
                printf("Enter new score for course %d: ", j+1);
                scanf("%f", &students[i].scores[j]);
                students[i].total_score += students[i].scores[j];
            }
            students[i].avg_score = students[i].total_score / num_courses;
            printf("Student modified successfully.\n");
            return;
        }
    }
    printf("Student not found.\n");
}

void delete_student() {
    char id[MAX_ID_LEN];
    printf("Enter student id to delete: ");
    scanf("%s", id);
    for (int i = 0; i < num_students; i++) {
        if (strcmp(students[i].id, id) == 0) {
            for (int j = i; j < num_students-1; j++) {
                students[j] = students[j+1];
            }
            num_students--;
            printf("Student deleted successfully.\n");
            return;
        }
    }
    printf("Student not found.\n");
}

void output_students() {
    printf("id\tname");
    for (int i = 0; i < num_courses; i++) {
        printf("\tcourse %d", i+1);
    }
    printf("\ttotal score\tavg score\n");
    for (int i = 0; i < num_students; i++) {
        printf("%s\t%s", students[i].id, students[i].name);
        for (int j = 0; j < num_courses; j++) {
            printf("\t%.2f", students[i].scores[j]);
        }
        printf("\t%.2f\t%.2f\n", students[i].total_score, students[i].avg_score);
    }
}

void insert_student() {
    int pos;
    if (num_students >= MAX_STUDENTS) {
        printf("Maximum number of students reached.\n");
        return;
    }
    printf("Enter position to insert (0-%d): ", num_students);
    scanf("%d", &pos);
    if (pos < 0 || pos > num_students) {
        printf("Invalid position.\n");
        return;
    }
    struct Student s;
    printf("Enter student id: ");
    scanf("%s", s.id);
    printf("Enter student name: ");
    scanf("%s", s.name);
    for (int i = 0; i < num_courses; i++) {
        printf("Enter score for course %d: ", i+1);
        scanf("%f", &s.scores[i]);
        s.total_score += s.scores[i];
    }
    s.avg_score = s.total_score / num_courses;
    for (int i = num_students; i > pos; i--) {
        students[i] = students[i-1];
    }
    students[pos] = s;
    num_students++;
    printf("Student inserted successfully.\n");
}

void search_student() {
    char id[MAX_ID_LEN];
    printf("Enter student id to search: ");
    scanf("%s", id);
    for (int i = 0; i < num_students; i++) {
        if (strcmp(students[i].id, id) == 0) {
            printf("id\tname");
            for (int j = 0; j < num_courses; j++) {
                printf("\tcourse %d", j+1);
            }
            printf("\ttotal score\tavg score\n");
            printf("%s\t%s", students[i].id, students[i].name);
            for (int j = 0; j < num_courses; j++) {
                printf("\t%.2f", students[i].scores[j]);
            }
            printf("\t%.2f\t%.2f\n", students[i].total_score, students[i].avg_score);
            return;
        }
    }
    printf("Student not found.\n");
}

void sort_students() {
    int choice;
    printf("Sort by:\n");
    printf("1. Total Score\n");
    printf("2. Average Score\n");
    printf("Enter choice: ");
    scanf("%d", &choice);
    for (int i = 0; i < num_students; i++) {
        for (int j = i+1; j < num_students; j++) {
            if (choice == 1 && students[i].total_score < students[j].total_score) {
                struct Student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            } else if (choice == 2 && students[i].avg_score < students[j].avg_score) {
                struct Student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
    printf("Students sorted successfully.\n");
}

int main() {
    int choice;
    printf("Enter number of students: ");
    scanf("%d", &num_students);
    printf("Enter number of courses: ");
    scanf("%d", &num_courses);
    while (1) {
        printf("\n1. Add Student\n");
        printf("2. Modify Student\n");
        printf("3. Delete Student\n");
        printf("4. Output Students\n");
        printf("5. Insert Student\n");
        printf("6. Search Student\n");
        printf("7. Sort Students\n");
        printf("8. Quit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                modify_student();
                break;
            case 3:
                delete_student();
                break;
            case 4:
                output_students();
                break;
            case 5:
                insert_student();
                break;
            case 6:
                search_student();
                break;
            case 7:
                sort_students();
                break;
            case 8:
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
    }
    return 0;
}

这个代码实现了一个简单的学生成绩管理系统，包含录入、修改、删除、输出、插入、查询和排序等功能。运行程序后，会提示输入班级总人数和课程数，然后进入菜单界面，用户可以根据需要选择相应的功能。