Date::Date()
{
day = 15;
month = 03;
year = 4;
}
Date::Date(int d, int m, int y)
{
day = d;
month = m;
year = y;
}
->
Date(int d = 15, int m = 3, int y = 5)
//...
Date::Date(int d, int m, int y) : day(d), month(m), year(y)
{
}
03 is octal, although in this case it doesn't matter.