Fix _CRT_SECURE_NO_WARNINGS in VC++

Error:

To disable deprecation, use _CRT_SECURE_NO_WARNINGS.

Error    1    error C4996: 'sscanf': This function or variable may be unsafe. Consider using sscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

Error    1    error C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

Solution:

Go to Project -> Properties -> C/C++ -> Preprocessor -> Preprocessor Definitions and add _CRT_SECURE_NO_WARNINGS in the list.

This Visual C++ warning, C4996, flags standard C functions such as sscanf and fopen as unsafe because they do not bound their buffers, and MSVC suggests the _s secure variants instead.

You can switch to the suggested secure functions, or define _CRT_SECURE_NO_WARNINGS to silence the warning once you have reviewed the usage. Portable code often keeps the standard functions and disables the warning.