C and C based languages - Functions, Macros and programs in multiple files

Functions, Macros and programs in multiple files - C and C based languages module C204

As your code grows from 5 to 50 to 500 lines, it becomes less managable as a single block. Functions allow code to be split into more managable blocks, which can then be saved into separate files if you like so that the same logic can be shared between a number of different programs where appropriate.

This topic is presented on public courses Programming in C, C and C++ Programming

Examples from our training material

fundy.c	call by value v call by pointer / reference
funfiles.c	The home for an extern variable
funfuncs.c	use of extern to reference variable held elsewhere
makefile	makefile for module C204
tcall.c	Function definition and call
tcmain.c	Using functions
tcsub.c	Functions in their own file
tcsub.h	Using functions - the header file

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

Defining functions.
Parameters and return values.
Exercise.
Function prototypes.
Variable scope and global variables.
Constants.
Header files and other Macros

Complete learning

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