Please- how void printInfo() and void printDate() are working here. How variable 'bd' prints date? Can we use cout instead?

Question

#include <iostream>
using namespace std;

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

The word limit exceeded so,
Here's the whole code:

#include <iostream>
using namespace std;

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;
};

class Person {
public:
Person(string n, Birthday b)
: name(n), bd(b)
{ }
void printInfo()
{
cout << name << endl;
bd.printDate();
}
private:
string name;
Birthday bd;
};

int main() {
Birthday bd(2, 21, 1985);
Person p("David", bd);
p.printInfo();
}

Answer 2

Thanks @black temple

Answer 3

why thanking me brother?