What is the difference between a header file and a module?
Are both always necessary?
What is the difference between a header file and a module?
Are both always necessary?
A header file contains declarations only. A module (if you refer to the separately compiled c file) contains the actual data.
The header file tells the other parts of the program what is in the module since they don't know until the linking occurs.
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so are both always necessary?
Modules are the ones that do the work, header files are the ones that give you access to the modules, so you need both.
>> so are both always necessary?
You use the word always so I'm going to assume you mean always. The answer is this, you only need a header when you use a function that is in the actual module. Even if you compile a library (or whatever form of module you are refering to) or something into your program!
