Operator Overloading Problem

[Rajkumar MCA]

#include <iostream>
using namespace std;

class Distance
{
private:
int feet; // 0 to infinite
int inches; // 0 to 12
public:
// required constructors
Distance(){
feet = 0;
inches = 0;
}
Distance(int f, int i){
feet = f;
inches = i;
}
friend ostream &operator<<( ostream &output,
const Distance &D ) // How it will Works
{
cout<<"\n O Stream\n";
output << "F : " << D.feet << " I : " << D.inches;
return output;
}

friend istream &operator>>( istream &input, Distance &D )
{
cout<<"\n I Stream\n";
input >> D.feet >> D.inches;
return input;
}
};
int main()
{
Distance D1(11, 10), D2(5, 11), D3;

cout << "Enter the value of object : " << endl;
cin >> D3;
cout << "First Distance : " << D1 << endl;
cout << "Second Distance :" << D2 << endl;
cout << "Third Distance :" << D3 << endl;


return 0;
}


Can any one explain the above program. why Friend Keyword is used for Operator Overloading concept.

[dhayden]

That's a little weird because it's defining the operators inside the class definition. But in any case, the operators need to be a friend of the class because they have access to the private members.