帮我写一个学生管理系统代码

好的，以下是一个简单的学生管理系统代码，包括添加学生、查找学生、修改学生信息和删除学生：

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

#define MAX_STUDENTS 100

struct student {
    int id;
    char name[50];
    int age;
    float gpa;
};

struct student students[MAX_STUDENTS];
int num_students = 0;

void add_student() {
    if (num_students >= MAX_STUDENTS) {
        printf("Error: Maximum number of students reached\n");
        return;
    }

    struct student s;
    printf("Enter student ID: ");
    scanf("%d", &s.id);
    printf("Enter student name: ");
    scanf("%s", s.name);
    printf("Enter student age: ");
    scanf("%d", &s.age);
    printf("Enter student GPA: ");
    scanf("%f", &s.gpa);

    students[num_students] = s;
    num_students++;

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

void find_student() {
    int id;
    printf("Enter student ID: ");
    scanf("%d", &id);

    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            printf("Student found:\n");
            printf("ID: %d\n", students[i].id);
            printf("Name: %s\n", students[i].name);
            printf("Age: %d\n", students[i].age);
            printf("GPA: %f\n", students[i].gpa);
            return;
        }
    }

    printf("Error: Student not found\n");
}

void update_student() {
    int id;
    printf("Enter student ID: ");
    scanf("%d", &id);

    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            printf("Enter new student name: ");
            scanf("%s", students[i].name);
            printf("Enter new student age: ");
            scanf("%d", &students[i].age);
            printf("Enter new student GPA: ");
            scanf("%f", &students[i].gpa);
            printf("Student updated successfully\n");
            return;
        }
    }

    printf("Error: Student not found\n");
}

void delete_student() {
    int id;
    printf("Enter student ID: ");
    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 deleted successfully\n");
            return;
        }
    }

    printf("Error: Student not found\n");
}

int main() {
    int choice;

    while (1) {
        printf("\n");
        printf("1. Add student\n");
        printf("2. Find student\n");
        printf("3. Update student\n");
        printf("4. Delete student\n");
        printf("5. Exit\n");
        printf("\nEnter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                find_student();
                break;
            case 3:
                update_student();
                break;
            case 4:
                delete_student();
                break;
            case 5:
                exit(0);
            default:
                printf("Error: Invalid choice\n");
        }
    }

    return 0;
}

注意：本代码仅供参考，实际使用时可能需要根据具体需求做出修改。