constructor and deconstructor

#include <iostream>
#include<string>
#include<vector>

using namespace std;

class B 
{
private:
	int data;
public:
	B()
	{
		cout << "default constructor" << endl;
	}
	~B()
	{
		cout << "destructed" << endl;
	}

	B( int i ) : data(i)
	{
		cout << "constructor by parameter" << data <<endl;
	}
};

B Play ( B b)
{
	return b;
}

int main()
{
	B temp = Play(5);// Play call the constructor(with parameter)，initialize the parameter data,make data=5;
	return 0;        // temp and Play object ,call the defaule deconstructor;
}