02. const and functions

#include <iostream>

using namespace std;

class Dog
{
    int age;
    string name;
public:
    Dog() { age = 3; name = "dummy"; }

    // const parameters
    void setAge(const int& a) { age = a; cout << "Set age const" << endl; } // when the parater is const
    void setAge(int &a) { age = a; cout << "Set age non-const" << endl; /// when the parameters non-const
     }

    // const return value
    const string& getName() { return name; }

    // const function
    void printDogName() const // works when the object is non const
    {
        cout << name << " const " << endl;
    //  age++; this doesn't work cause of const
    }

    void printDogName() // works when the object is non const
    {
        cout << name << " non-const " << endl;
        //  age++; this doesn't work cause of const
    }
};


int main()
{
    Dog d;
    const int age = 10;
    int age2 = 20;
    d.setAge(age);
    d.setAge(age2);
    d.printDogName();


    const Dog d2;
    d2.printDogName();
}