Problem Description 定义一个Tree(树)类，有成员ages(树龄)，成员函数grow(int years)对ages加上years, age()显示Tree对象的ages的

#include<iostream>

class Tree

{

public:

 Tree (int x) {ages=x;};

 void grow(int );

 void age ( );

private:

 int ages;

 int years;

};

 

void Tree :: grow (int years)

{

 int sum=years+Tree::ages;

 std :: cout <<sum<<std ::endl;

};

void Tree :: age()

{

 std :: cout<<ages;

}

int main()

{

 Tree a(2);

 a.grow(2);

 a.age();

 

}