Description

當然，一個student首先是一個person。所以，Student類是Person類的派生類。請定義Person類，包括：

1. 資料成員string name和int age，分別表示姓名和年齡。

2. 建構函式和解構函式，它們有相應的輸出，見樣例。

3. void show()函式：按照樣例輸出該物件的name和age屬性值。

定義Student類，是Person類的子類：

1. 資料成員int grade，表示學生所在年級。

2. 建構函式和解構函式，它們有相應的輸出，見樣例。

3. void show()函式：按照樣例輸出該物件的grade屬性值。

Input

只有1行，分為三部分：一個不含空白符的字串以及兩個整數。

Output

見樣例。

Sample Input
Tom 19 3
Sample Output
A person Tom whose age is 19 is created.
A student whose grade is 3 is created.
Name is Tom and age is 19.
Grade is 3.
A student whose grade is 3 is erased.
A person Tom whose age is 19 is erased.
HINT

Append Code
append.cc,

int main()
{
    string n;
 

    int a, g;
    cin>>n>>a>>g;
    Student student(n, a, g);
    student.Person::show();
    student.show();
    return 0;
}

第二種方法在第一種方法的基礎上有一定的改進；
AC程式碼一

#include <iostream>

using namespace std;
class Person
{
private:
    string name;
    int age;
public:
    Person():name(""
 
),age(0){}
    Person(string na,int a):name(na),age(a){cout<<"A person "<<name<<" whose age is "<<age<<" is created."<<endl;}
    void show(){cout<<"Name is "<<name<<" and age is "<<age<<"."<<endl;}
    ~Person(){cout<<"A person "<<name<<" whose age is "<<age<<" is erased."<<endl;}

};
class Student :public Person //無分號，這裡一定要注意；
{
private:
    int grade;
public:
    Student(string na,int a,int g):Person(na,a),grade(g){cout<<"A student whose grade is "<<grade<<" is created."<<endl;}
    void show(){cout<<"Grade is "<<grade<<"."<<endl;}
    ~Student(){cout<<"A student whose grade is "<<grade<<" is erased."<<endl;}
};
int main()
{
    string n;
    int a, g;
    cin>>n>>a>>g;
    Student student(n, a, g);
    student.Person::show();
    student.show();
    return 0;
}

AC程式碼二

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

class Person
{
private:
    string name;
    int age;
public:
    Person(string na="",int ag=0):name(na),age(ag){cout<<"A person "<<name<<" whose age is "<<age<<" is created."<<endl;}
    void show(){cout<<"Name is "<<name<<" and age is "<<age<<"."<<endl;}
    ~Person(){cout<<"A person "<<name<<" whose age is "<<age<<" is erased."<<endl;}
};
class Student:public Person
{
private:
    int grade;
public:
    Student(string na="",int ag=0,int gr=0):Person(na,ag),grade(gr){cout<<"A student whose grade is "<<grade<<" is created."<<endl;}
    void show(){cout<<"Grade is "<<grade<<"."<<endl;}
    ~Student(){cout<<"A student whose grade is "<<grade<<" is erased."<<endl;}
};
int main()
{
    string n;
    int a, g;
    cin>>n>>a>>g;
    Student student(n, a, g);
    student.Person::show();
    student.show();
    return 0;
}