This is the platform dependent conversion specifier for scanning and printing values of type #guint64. See also #G_GINT16_FORMAT.
Some platforms do not support scanning and printing 64-bit integers,
even though the types are supported. On such platforms
is not defined. Note that
scanf() may not support 64-bit integers, even
G_GINT64_FORMAT is defined. Due to its weak error handling,
is not recommended for parsing anyway; consider using