设计一个表示猫的类，包括猫的颜色、体重、年龄等数据，具有设置猫的颜 色，修改和显示猫的体重、年龄等操作用c++实现

以下是用 C++ 实现的猫的类：

class Cat {
private:
    string color;
    double weight;
    int age;
public:
    void setColor(string c) {
        color = c;
    }
    void setWeight(double w) {
        weight = w;
    }
    void setAge(int a) {
        age = a;
    }
    void modifyWeight(double w) {
        weight += w;
    }
    void modifyAge(int a) {
        age += a;
    }
    void display() {
        cout << "Color: " << color << endl;
        cout << "Weight: " << weight << " kg" << endl;
        cout << "Age: " << age << " years old" << endl;
    }
};

使用示例：

int main() {
    Cat myCat;
    myCat.setColor("White");
    myCat.setWeight(4.5);
    myCat.setAge(3);
    myCat.display();
    // Output: Color: White
    //         Weight: 4.5 kg
    //         Age: 3 years old
    
    myCat.modifyWeight(-0.5);
    myCat.modifyAge(1);
    myCat.display();
    // Output: Color: White
    //         Weight: 4 kg
    //         Age: 4 years old
    
    return 0;
}