#include <iostream>

 #include <string>

 using namespace std;

 class Dog

 {

 public:

     Dog(string n, int a, double w) :name(n), age(a), weight(w) {}

     operator int() const//转换函数，用来做转化操作符,int()括号里面必须是空的，必须定义为const

     {

         return age;

     }

     operator double() const//转换函数

     {

         return weight;

     }

     operator std::string() const//转换函数

     {

         return name;

     }

 private:

     int age;

     double weight;

     string name;

 };

 int main()

 {

     int a, b;

     a = ;

     b = a;

     Dog d("Bill",,15.0);

     b = d; //d得到的是整形，调用转换函数，operator int()

     cout << b << endl;

     getchar();

     return ;

 }