Web Reference: A few headers do not use the include guard idiom. One specific example is the standard header. It may be included multiple times in a single translation unit, and the effect of doing so depends on whether the macro NDEBUG is defined each time the header is included. Jul 23, 2025 · Now lets resolve the issue using include guards. In the C and C++ programming languages, an #include guard, sometimes called a macro guard, header guard, or file guard, is a particular construct used to avoid the problem of double inclusion when dealing with the include directive. How to use include guards in C to prevent the contents of header files from being included multiple times, potentially causing compiler errors when something is defined multiple times.
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