OOAD Functions Q/A #3

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Question:Differentiate between friend function and member functions.

Answer:

Sr. No. Friend Function Member Function
1 Friend function is a non-member function that has access to private and protected members of a class. It is not in the scope of the class in which it is declared. Member function is in scope of the class in which it is declared.
2 A friend function cannot be called using object of the class. A member function is called using object of the class.
3 friend keyword is used to declare a function as friend function. No such keyword is required.
4 Class definition using friend function: 
class trial
{	
private: {
Public:	{
friend void check ( );	
}	

void check ( );
Class definition using member function: 
class trial
{	
private: {
Public:	{
void check ( );	
}	
trial:: void check ( );	
}
5 A friend function can be declared as friend in any number of classes. A member function is a part of any class in which it is declared.
6 A friend function can be declared in private, public or protected scope of the class without any effect. A member function can be declared in private, public or protected scope of the class but have scope accordingly.
7 While overloading binary operator, friend function takes two arguments. While overloading binary operator, member function takes one arguments.
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