请写出学生成绩管理系统的c语言代码

以下是一个简单的学生成绩管理系统的 C 语言代码示例：

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

#define MAX_STUDENTS 100

typedef struct {
    char name[50];
    int id;
    float grade;
} Student;

void add_student(Student students[], int *num_students) {
    if (*num_students >= MAX_STUDENTS) {
        printf("Error: Maximum number of students reached.\n");
        return;
    }

    Student s;

    printf("Enter name: ");
    scanf("%s", s.name);

    printf("Enter ID: ");
    scanf("%d", &s.id);

    printf("Enter grade: ");
    scanf("%f", &s.grade);

    students[*num_students] = s;
    (*num_students)++;

    printf("Student added successfully.\n");
}

void remove_student(Student students[], int *num_students) {
    int id;
    printf("Enter ID of student to remove: ");
    scanf("%d", &id);

    for (int i = 0; i < *num_students; i++) {
        if (students[i].id == id) {
            for (int j = i; j < *num_students - 1; j++) {
                students[j] = students[j + 1];
            }
            (*num_students)--;
            printf("Student removed successfully.\n");
            return;
        }
    }

    printf("Error: Student with ID %d not found.\n", id);
}

void print_students(Student students[], int num_students) {
    printf("Name\tID\tGrade\n");
    for (int i = 0; i < num_students; i++) {
        printf("%s\t%d\t%.2f\n", students[i].name, students[i].id, students[i].grade);
    }
}

int main() {
    Student students[MAX_STUDENTS];
    int num_students = 0;
    int choice;

    while (1) {
        printf("\nStudent Grade Management System\n");
        printf("1. Add Student\n");
        printf("2. Remove Student\n");
        printf("3. Print Students\n");
        printf("4. Exit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_student(students, &num_students);
                break;
            case 2:
                remove_student(students, &num_students);
                break;
            case 3:
                print_students(students, num_students);
                break;
            case 4:
                printf("Exiting program.\n");
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
    }

    return 0;
}

该代码中定义了一个 `Student` 结构体，该结构体包含学生的姓名、ID 和成绩。然后，定义了三个函数来实现添加学生、删除学生和打印学生列表的功能。最后，在 `main()` 函数中实现了一个简单的菜单，让用户可以选择要执行的操作。