What does the colon operator do here?

Question

In the birthday program
class Birthday {
public:
Birthday(int m, int d, int y)
: month(m), day(d), year(y)
{
}
void printDate()
{
cout<<month<<"/"<<day
<<"/"<<year<<endl;
}
private:
int month;
int day;
int year;
};

Answer 1

this colon operator is used here in member intializer list . for more on member intializer list check out this https://www.geeksforgeeks.org/when-do-we-use-initializer-list-in-c/

Answer 2

I think u forgot to make your birthday program public or provide us the link so we can try telling what colon operator do there

Answer 3

Where’s the birthday program post code plz