explicit - 명시적형변환(자동형변환을 금지한다)

#include <iostream>
using namespace std;

class Person
{
private:
	int age;
public:
	explicit Person(int _age) { age = _age; }    
	void Print() { cout << age; }
	
};   

int main(void)
{
	Person per = (Person)11;      
	per.Print();
	return 0;
}