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OOAD Functions Q/A #3
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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