what is object composition and friend function in C++

Object Composition   In real-world programs an object is made up of several parts. For example a car is made up of several parts (objects) like engine, wheel, door etc. This kind of whole part relationship is known as composition which is also known as has-a relationship. Composition allows us to create separate class for each task. Following are the advantages or benefits of composition: Each class can be simple and straightforward. A class can focus on performing one specific task. Classes will be easier to write, debug, understand, and usable by other people. Lowers the overall complexity of the

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what is object composition and friend function in C++
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