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const used with functions

const used with functions :
class Dog {
   int age;
   string name;
public:
   Dog() { age = 3; name = "dummy"; }
   
   // const parameters and these are overloaded functions
   void setAge(const int& a) { age = a; }
   void setAge(int& a) { age = a; }
   
   // Const return value
   const string& getName() {return name;}
   
   // const function and these are overloaded functions
   void printDogName() const { cout << name << "const" << endl; }  // value of name can't be modified
   void printDogName() { cout << getName() << " non-const" << endl; }
};

 int main() {
   Dog d;
   d.printDogName();
   
   const Dog d2;
   d2.printDogName();
   
}
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