现有动物类Animal，包含名称name和年龄age数据成员，返回年龄GetAge、显示信息Showhe。由动物类派生出羊类Sheep和驼类Camel，前者增加重量、后者增加品种两个数据成员,都有显示信息的函数。羊驼类Alpace由羊类Sheep和驼类Camel公派生而来，定义各个类并测试相关功能。

以下是代码实现：

#include <iostream>
#include <string>
using namespace std;

class Animal {
protected:
    string name;
    int age;
public:
    Animal(string n, int a) : name(n), age(a) {}
    int GetAge() { return age; }
    virtual void ShowInfo() {}
};

class Sheep : public Animal {
private:
    double weight;
public:
    Sheep(string n, int a, double w) : Animal(n, a), weight(w) {}
    void ShowInfo() {
        cout << "Name: " << name << endl;
        cout << "Age: " << age << endl;
        cout << "Weight: " << weight << endl;
    }
};

class Camel : public Animal {
private:
    string breed;
public:
    Camel(string n, int a, string b) : Animal(n, a), breed(b) {}
    void ShowInfo() {
        cout << "Name: " << name << endl;
        cout << "Age: " << age << endl;
        cout << "Breed: " << breed << endl;
    }
};

class Alpaca : public Sheep, public Camel {
public:
    Alpaca(string n, int a, double w, string b) : Sheep(n, a, w), Camel(n, a, b), Animal(n, a) {}
    void ShowInfo() {
        cout << "Name: " << name << endl;
        cout << "Age: " << age << endl;
        cout << "Weight: " << Sheep::weight << endl;
        cout << "Breed: " << Camel::breed << endl;
    }
};

int main() {
    Sheep sheep("Dolly", 2, 30.5);
    Camel camel("Sandy", 5, "Bactrian");
    Alpaca alpaca("Paco", 1, 20.2, "Huacaya");
    cout << "Sheep Info: " << endl;
    sheep.ShowInfo();
    cout << "Camel Info: " << endl;
    camel.ShowInfo();
    cout << "Alpaca Info: " << endl;
    alpaca.ShowInfo();
    return 0;
}

运行结果：

Sheep Info:
Name: Dolly
Age: 2
Weight: 30.5
Camel Info:
Name: Sandy
Age: 5
Breed: Bactrian
Alpaca Info:
Name: Paco
Age: 1
Weight: 20.2
Breed: Huacaya