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What is a function and built-in function?
function is that when large program is divided into sub programs.where as each one done one or more actions to be performed for a large program. Those subprograms are called functions.they support only static and extern storage classes.  

Built-in functions(Library function) that which are predefined and supplied with the compiler called as built-in functions.
Posted By: Name:Rajesh Kr URL: What is a function and built-in function?