C++习题-使用带有默认参数的构造函数[3.3]

#include <iostream>
using namespace std;

class Date
{
      public :
      Date(int = 1,int = 1,int = 2005);
      void Display();
      
      private:
      int month;
      int day;
      int year;
};

Date::Date(int m,int d,int y):month(m),day(d),year(y){}

void Date::Display()
{
    cout << month << "/" << day << "/" << year << endl;
}

int main()
{
    Date d1(10,13,2005);
    Date d2(12,30);
    Date d3(10);
    Date d4;
    
    d1.Display();
    d2.Display();
    d3.Display();
    d4.Display();
    
    system("pause");
    return 0;
}