Description
定义一个类Demo，有构造函数、析构函数和成员函数show()，其中show()根据样例的格式输出具体属性值。该类只有一个int类型的成员。
Input
输入只有一个整数，int类型范围内。
Output
见样例。
Sample Input
-100
Sample Output
A data 10 is created! A data 0 is created! A data -100 is created! This is data 10 This is data 0 This is data -100 A data -100 is erased! A data 0 is erased! A data 10 is erased!
HINT
Append Code
int main()
{ Demo tmp(10), tmp2;
int d;
cin>>d;
Demo tmp3(d);
tmp.show();
tmp2.show();
tmp3.show();
return 0;
}代码
#include <iostream>
using namespace std;
class Demo
{
int a;
public:
Demo(int x=0):a(x)
{
cout<<"A data "<<a<<" is created!"<<endl;
}
~Demo(){cout<<"A data "<<a<<" is erased!"<<endl;}
void show()
{
cout<<"This is data "<<a<<endl;
}
};
int main()
{
Demo tmp(10), tmp2;
int d;
cin>>d;
Demo tmp3(d);
tmp.show();
tmp2.show();
tmp3.show();
return 0;
}