构造函数重载

#include"iostream.h"
class date
{
private:
 int year;
 int month;
 int day;
public:
    date()
 {
  year=2000; month=1;day=1;
  cout<<year<<"/"<<month<<"/"<<day<<endl;
 }
 date(int d)
 {
  year=2000; month=1;day=d;
  cout<<year<<"/"<<month<<"/"<<day<<endl;
 }
date(int m,int d)
{
        year=2000; month=m;day=d;
  cout<<year<<"/"<<month<<"/"<<day<<endl; 
}
date(int y,int m,int d)
{
        year=y; month=m;day=d;
  cout<<year<<"/"<<month<<"/"<<day<<endl;
}
};
void main()
{
    date aday;
 date bdate(10);
 date cdate(8,8);
 date ddate(2007,10,10);
}