Friend function OOPC
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The document discusses the concept of friend functions in C++, which allow non-member functions to access private data of multiple classes. It explains the syntax, characteristics, and usage of friend functions, including the ability to declare a class as a friend. The document also presents a real-life analogy to clarify the concept.
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Friend function OOPC
- 1. OOPC FRIEND FUNCTION Dhananjaysinh Jhala SY CE-1, Batch B 170410107027
- 2. FRIEND FUNCTION While learning C++, we have emphasized on the fact that private members cannot be accessed from outside the class i.e. A non member function cannot have access to the private data of a class. However, there could arise a situation where we would like 2 classes to share a particular function. In such situations, C++ allows a common function to be made friendly with both the classes, allowing the function to have access to the private members of these classes outside the class. This can be seen as a real life analogy, where is a person would like to come in your house, then you need to declare him as your friend so that I can access your private resources.
- 3. Syntax of the friend function is given below Function declared with the keyword friend is called friend function.
- 4. Some special characteristics of friend function are as follows: It is not in the scope of the class to which it has been declared as friend. It can be invoked like a normal function without any object needed. Unlike Member function, it cannot access the member names directly, and has to use object name and dot membership operator with each member name. It can be declared as public or private without affecting its meaning Usually it has object as arguments
- 5. Member functions of one class can be friend functions of another class. In such cases, they are designed using the scope resolution operator. We can also declared the class as a friend class.
- 6. PROGRAM TO FIND AVERAGE USING FRIEND FUNCTION
- 8. OUTPUT