Why must the symbol/name used in C++'s  inclusion guard on a library interface file be unique? (Hint: A good technique to use here is proof by contradiction -- assume that the symbol needn't be unique and show what happens when two libraries to be #include'd in the same program share the same symbol.)

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Class

Object Oriented Programming System (OOPs) is a programming model built on the perception of “objects” that contains data and methods. The major purpose of Object Oriented Programming is to increase the maintainability and flexibility of programs. Object Oriented Programming gets together data and its behavior (methods) in a single location (object) which makes it easier to understand.