How to use _CRT_SECURE_NO_WARNINGS?
When a function is declared with _CRT_SECURE_NO_WARNINGS, the compiler removes all warnings (and turns them off by default) that would be generated by calls to those functions. The warning removal is done entirely at compile time, so there is no overhead in running the program. In addition, if the calling code is compiled with /Wall and also compiled.
_CRT_SECURE_NO_WARNINGS, then everything gets turned off by default (assuming you are using recent versions of Microsoft Visual Studio and not rolling your own compiler).
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