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I have a fair amount of practice with Java as a programming language, but I am completely new to C. I understand that a header file contains forward declarations for methods and variables. How is this different from an abstract class in Java?
IMO it’s mainly because many C programmers seem to think that Java programmers don’t know how to program “for real”, e.g. handling pointers, memory and so on.
I would rather compare headers to Java interfaces, in the sense that they generally define how the API must be used.
Headers are basically just a way to avoid copy-pasting: the preprocessor simply includes the content of the header in the source file when encounters an
#includedirective.You put in a header every declaration that the user will commonly use.