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Asked: 2026-05-10T13:57:36+00:00

When Eclipse creates a new file ( .c or .h file) in a C

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When Eclipse creates a new file (.c or .h file) in a C project the editor always auto creates a #define at the top of the file like this: If the file is named ‘myCFile.c’ there will be a #define at the start of the file like this

#ifndef MYCFILE_C_ #define MYCFILE_C_

I have seen other editors do this as well (Codewright and SlikEdit I think). The #defines don’t seem to do anything for the editor as I can just delete them without any problem, and I can’t think of a reason why I would want to use them. Does anyone know why they are there?

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1 Answer

  1. It’s to guard against multiple definitions.

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