Use the j length modifier in calls to scanf() and printf()
j specifies that a following d, i, o, u, x, X, or n conversion specifier applies
to an argument with type pointer to intmax_t or uintmax_t.
Section 7.18.1.5, "Greatest-width integer types"
1 The following type designates a signed integer type capable of representing any value of
any signed integer type:
intmax_t
The following type designates an unsigned integer type capable of representing any value
of any unsigned integer type:
uintmax_t