C语言面向对象编程：面向对象设计与实现问答

// 声明一个类
struct Person {
    char* name;
    int age;
};

// 创建一个对象
struct Person john = {"John", 30};

// Base class (基类)
struct Shape {
    double area;
};

// Derived class (派生类)
struct Circle : public Shape {
    double radius;
};

// 基类
struct Animal {
    virtual void makeSound() = 0; // 纯虚函数
};

// 派生类
struct Dog : public Animal {
    void makeSound() {
        printf("Woof!\n");
    }
};

// 学生类
struct Student {
    char* name;
    int age;
    float gpa;
};

// 学生列表类
struct StudentList {
    struct Student* students;
    int numStudents;
};

// 创建学生列表
struct StudentList* createStudentList() {
    struct StudentList* list = malloc(sizeof(struct StudentList));
    list->students = NULL;
    list->numStudents = 0;
    return list;
}

// 向列表中添加学生
void addStudent(struct StudentList* list, struct Student* student) {
    list->students = realloc(list->students, (list->numStudents + 1) * sizeof(struct Student));
    list->students[list->numStudents++] = *student;
}

// 打印列表中的学生信息
void printStudentList(struct StudentList* list) {
    for (int i = 0; i < list->numStudents; i++) {
        printf("Name: %s, Age: %d, GPA: %.2f\n",
               list->students[i].name, list->students[i].age, list->students[i].gpa);
    }
}