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A large program can typically be split into small sub-programs (blocks) called as functions where each sub-program can perform some specific functionality. Functions reduce the size and complexity of a program, makes it easier to understand, test, and check for errors. The functions which are available by default known as “Built-in” functions and user can create their own functions known as “User-defined” functions.
• Built-in functions – Functions which are available in C++ language standard library.
• User-defined functions – Functions created by users.
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