重载

#include <iostream>  
using namespace std;  

class A{
private:
	int n;
public:
	A();
	A(int n);
	void show();
};

A::A()
{
	cout << "call A()" << this << endl;
	n = 100;
}

A::A(int n)
{
	cout << "call A(int n)" << this << endl;
	this->n = n;
}

void A::show()
{
	cout << "n=" << n << endl;
}

int main()
{
	A a1;
	A a2(200);
	
	a1.show();
	a2.show();

	
	return 0;
}