帮我用c语言写一个，学生信息系统管理代码

当然可以，以下是一个简单的学生信息系统管理代码的示例：

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

#define MAX_STUDENTS 100

struct student {
    char name[50];
    int id;
    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 name: ");
    scanf("%s", s.name);
    printf("Enter student ID: ");
    scanf("%d", &s.id);
    printf("Enter student GPA: ");
    scanf("%f", &s.gpa);

    students[num_students++] = s;
    printf("Student added successfully.\n");
}

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

int main() {
    int choice;
    do {
        printf("1. Add student\n");
        printf("2. Print students\n");
        printf("3. Quit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                print_students();
                break;
            case 3:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice.\n");
                break;
        }
    } while (choice != 3);

    return 0;
}

这个程序使用结构体来存储学生的姓名、学号和GPA，并提供了添加学生和打印学生信息的功能。请注意，这只是一个简单的示例，实际的学生信息系统可能需要更多的功能和更复杂的数据结构。