實例化類時，采用無參的構(gòu)造函數(shù)要出錯是怎么回事?。?/h1>

#include?<iostream>
#include?<string>
using?namespace?std;

class?Teacher
{
public:
	Teacher()
	{
		m_strName?=?"Lily";
		cout?<<"?Teacher()"?<<?endl;
	}
	
	Teacher(int?_age?=?60)
	{
		m_iAge?=?_age;
		cout?<<"?Teacher(int?_age?=?60)"?<<?endl;
	}
	
	void?setName(string?_name)
	{
		m_strName?=?_name;
	}
	string?getName()
	{
		return?m_strName;
	}
	void?setAge(int?_age)
	{
		m_iAge?=?_age;
	}
	int?getAge()
	{
		return?m_iAge;
	}
private?:
	string?m_strName;
	int?m_iAge;
};

int?main(void)
{
	Teacher?t1;
	Teacher?t2(50);
	//cout?<<?droL.getName()?<<?endl;
	system("pause");

}