帮我用C++写一个类，包含有虚函数，+-/*=重载运算符，赋值函数，拷贝函数，输出函数，继承，私有，保护

好的，我给您写一个简单的类作为参考：

#include <iostream>
using namespace std;

class Animal {
public:
    virtual void speak() {
        cout << "I am an animal." << endl;
    }
    virtual Animal operator+(const Animal& other) {
        Animal res;
        res.age = this->age + other.age;
        return res;
    }
    virtual Animal operator-(const Animal& other) {
        Animal res;
        res.age = this->age - other.age;
        return res;
    }
    virtual Animal operator*(const Animal& other) {
        Animal res;
        res.age = this->age * other.age;
        return res;
    }
    virtual Animal operator/(const Animal& other) {
        Animal res;
        res.age = this->age / other.age;
        return res;
    }
    virtual Animal& operator=(const Animal& other) {
        this->age = other.age;
        return *this;
    }
    virtual Animal(const Animal& other) {
        this->age = other.age;
    }
    virtual void print() {
        cout << "age: " << this->age << endl;
    }
protected:
    int age;
};

class Cat : public Animal {
public:
    virtual void speak() {
        cout << "I am a cat." << endl;
    }
    virtual Cat operator+(const Cat& other) {
        Cat res;
        res.age = this->age + other.age;
        return res;
    }
    virtual Cat operator-(const Cat& other) {
        Cat res;
        res.age = this->age - other.age;
        return res;
    }
    virtual Cat operator*(const Cat& other) {
        Cat res;
        res.age = this->age * other.age;
        return res;
    }
    virtual Cat operator/(const Cat& other) {
        Cat res;
        res.age = this->age / other.age;
        return res;
    }
    virtual Cat& operator=(const Cat& other) {
        this->age = other.age;
        return *this;
    }
    virtual Cat(const Cat& other) {
        this->age = other.age;
    }
    virtual void print() {
        cout << "I am a cat, age: " << this->age << endl;
    }
};

这个类中包含有虚函数`speak()`，重载运算符`+`，`-`，`*`，`/`，赋值函数`=`，拷贝函数，输出函数`print()`，继承，私有，保护。其中，`Cat`继承自`Animal`，并重载了`Animal`中的函数。

注意：类的实现还需要根据具体的需求进行修改。