What is a function and built-in function?

A large program is subdivided into a number of smaller programs or subprograms. Each subprogram specifies one or more actions to be performed for a large program.such subprograms are functions. The function supports only static and extern storage classes.By default, function assumes extern storage class.functions have global scope. Only register or auto storage class is allowed in the function parameters. Built-in functions that predefined and supplied along with the compiler are known as built-in functions.They are also known as library functions.

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supriya ahire

Mar 23rd, 2006

   C program uses Both built in function and function(which is also called user defined)
     Built in function means the declaration and defination of afunction is already known to the compiler.
       Example : itoa()
     Function(user defined function) means user is going to declare and define that function in the program.function name is also user defined.
      Example : abc() etc.
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Supriya Ahire.