The `PRIuMAX` macro in particular is not necessary. It expands to a format usable for `uintmax_t`, but you can also use `"%ju"`. Both were introduced in ISO C9

The `PRIuMAX` macro in particular is not necessary. It expands to a format usable for `uintmax_t`, but you can also use `"%ju"`. Both were introduced in ISO C99. (Unless your `printf` implementation doesn't recognize `"%ju"`, and the `PRIuMAX` macro and friends are defined in some non-standard system-specific manner.)