用c语言写一个学生学籍管理系统

好的，以下是一个简单的学生学籍管理系统的 C 语言代码示例：

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

#define MAX_STUDENTS 100

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

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

void add_student() {
    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;
}

void print_student(struct student s) {
    printf("Name: %s\n", s.name);
    printf("ID: %d\n", s.id);
    printf("GPA: %.2f\n", s.gpa);
}

void print_all_students() {
    for (int i = 0; i < num_students; i++) {
        printf("Student %d:\n", i+1);
        print_student(students[i]);
    }
}

void save_students() {
    FILE *fp = fopen("students.txt", "w");
    if (fp == NULL) {
        printf("Error opening file!\n");
        return;
    }
    for (int i = 0; i < num_students; i++) {
        fprintf(fp, "%s %d %.2f\n", students[i].name, students[i].id, students[i].gpa);
    }
    fclose(fp);
}

void load_students() {
    FILE *fp = fopen("students.txt", "r");
    if (fp == NULL) {
        printf("Error opening file!\n");
        return;
    }
    while (!feof(fp)) {
        struct student s;
        fscanf(fp, "%s %d %f\n", s.name, &s.id, &s.gpa);
        students[num_students++] = s;
    }
    fclose(fp);
}

int main() {
    int choice;
    load_students();
    do {
        printf("\n1. Add student\n");
        printf("2. Print all students\n");
        printf("3. Save students to file\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                print_all_students();
                break;
            case 3:
                save_students();
                break;
            case 4:
                break;
            default:
                printf("Invalid choice!\n");
        }
    } while (choice != 4);
    return 0;
}

这个程序可以让用户添加学生信息，打印所有学生信息，将学生信息保存到文件中，并退出程序。