请使用c语言写一个学生信息管理系统

好的，以下是一个简单的学生信息管理系统的 C 代码示例：

#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 new_student;

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

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

    printf("Enter GPA: ");
    scanf("%f", &new_student.gpa);

    students[num_students] = new_student;
    num_students++;

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

void display_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);
    }
}

void search_student() {
    int search_id;

    printf("Enter ID to search: ");
    scanf("%d", &search_id);

    for (int i = 0; i < num_students; i++) {
        if (students[i].id == search_id) {
            printf("Name: %s\nID: %d\nGPA: %.2f\n", students[i].name, students[i].id, students[i].gpa);
            return;
        }
    }

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

int main() {
    int choice;

    while (1) {
        printf("\n1. Add student\n2. Display all students\n3. Search student by ID\n4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                display_students();
                break;
            case 3:
                search_student();
                break;
            case 4:
                exit(0);
            default:
                printf("Invalid choice.\n");
        }
    }
    
    return 0;
}

该程序支持添加学生、展示所有学生、根据 ID 搜索学生等功能。注意，该示例只是一个基本的框架，你可以根据需求添加更多功能和优化代码。