Header files are files with the source code that are intended to be included into other files (source or header) by the #include preprocessor directive. This distinction is pretty important and may help to รขโ‚ฌยฆ The c language has no concept of source files and header files (and neither does the compiler).

Remember that a header file is always #include d into a source file; I have been seeing code like this usually in the start of header files: #ifndef headerfile_h #define headerfile_h and at the end of the file is #endif what is the purpose of this?

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