I need to know what everything is What is the mutator functi

I need to know what everything is. What is the mutator function, constructor, member functions and anything else there might be.

#include <iostream>

using namespace std;

class NumberOfDays

{

private:

double hours;

double days;

public:

NumberOfDays()

{

}

NumberOfDays(double h)

{

hours = h;

}

double getDays();

void Ask();

};

double NumberOfDays::getDays()

{

return (hours/8);

}

void NumberOfDays::Ask()

{

cout << \"Enter number of work hours: \";

cin>>hours;

cout << endl;

}

int main()

{

NumberOfDays ob;

cout << \"Enter your information\" << endl;

ob.Ask();

cout<<\"Number of days: \"<<ob.getDays();

return 0;

}