CHAPTER 21
Headers
As a project grows it is common to split the code up into different source files. When this happens the interface and implementation are generally separated. The interface is placed in a header file, which commonly has the same name as the source file and a .h file extension. This header file contains forward declarations for the source file entities that need to be accessible to other compilation units in the project.
Why to Use Headers
C requires everything to be declared before it can be used. It is not enough to just compile the necessary source files in the same project. For example, if a function is placed in func.c, and ...
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