Function definitions

The elements of a function definition are as follows:

Function storage class specifiers, which specify linkage
Function return type specifiers, which specify the data type of a value to be returned
Function specifiers, which specify additional properties for functions
Function declarators, which include function identifiers as well as lists of parameters
The function body, which is a braces-enclosed series of statements representing the actions that the function performs
Constructor-initializers, which are used only in constructor functions declared in classes; they are described in Constructors (C++ only).
Try blocks, which are used in class functions; they are described in try blocks (C++ only).

IBM extension In addition, for compatibility with C++, you can use attributes to modify the properties of functions. They are described in Function attributes.

Function definitions take the following form:

C only

Function definition syntax
 
>>-+-------------------------+--+--------------------+---------->
   '-storage_class_specifier-'  '-function_specifier-'
 
>--+-----------------------+--function_declarator--{------------>
   '-return_type_specifier-'
 
>--function body--}--------------------------------------------><

End of C only

C++ only

Function definition syntax
 
>>-+-------------------------+--+--------------------+---------->
   '-storage_class_specifier-'  '-function_specifier-'
 
>--return_type_specifier--function_declarator------------------->
 
>--+----------------------------+--{--+-function body-+--}-----><
   '-:--constructor-initializer-'     '-try-block-----'

End of C++ only

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