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Indicates whether printf, _printf_l, wprintf, _wprintf_l-family functions support the %n format.
If %n is not supported (the default), encountering %n in the format string of any of the printf functions will invoke the invalid parameter handler as described in Parameter Validation. If %n support is enabled (see _set_printf_count_output) then %n will behave as described in printf Type Field Characters.
For additional compatibility information, see Compatibility in the Introduction.