- 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](../../c-runtime-library/parameter-validation.md). If `%n` support is enabled (see [_set_printf_count_output](../../c-runtime-library/reference/set-printf-count-output.md)) then `%n` will behave as described in [Format Specification Syntax: printf and wprintf Functions](../,,/c-runtime-library/format-specification-syntax-printf-and-wprintf-functions.md).
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