Header files

Separating code into multiple files When dealing with larger projects, it’s advisable to divide your code into separate files based on their purpose (function sets) You can use these self-made libraries to quickly add desired functionality to your code Typically used files mycode.h – header file, typically contains function prototypes, macros, [classes,] structures mycode.c – Code that implements the functions declared in the header file 2018 Risto Heinsar

Ways to use multiple files Using projects Must include headers (#include "myheader.h") Needs IDE support. E.g. Code::Blocks, Visual Studio, Eclipse etc. Compiling from the command line (small projects only) gcc -o myprogram file1.c file2.c Direct include (bad practice, never use) No need for an additional header Including a code file is sufficient (#include "mycode.c") Using Makefiles (recommended) 2018 Risto Heinsar

Try it out Download the sample package Familiarize yourself with the structure of these files Compile from command line gcc -o programname file1.c file2.c -Wall Ensure that it works NB! Windows requires you to add the compiler under PATH (already set for those using geany) In Linux you don’t need to do anything extra 2018 Risto Heinsar

Lab task Download and open the base code from the web Move the prototypes and other necessary items to the header file The data your going to be working with is already initialized Create the function implementations in another file, separate from main All functions except PrintStructArr() must return the found value Only function that is allowed to have print statements is PrintStructArr() The output for the rest of the functions can be done in main() If needed, you can create additional functions. Compile from command line 2018 Risto Heinsar