Why does each .h file starts with #ifndef #define #endif? We can certainly compile the program without those directives.
Why does each .h file starts with #ifndef #define #endif? We can certainly compile
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Why does each .h file starts with #ifndef #define #endif? We can certainly compile the program without those directives.
It’s a so-called “include guard”. The purpose is to prevent the file from having to be parsed multiple times if it is included multiple times.