C POOL — DAY 09

Grouping data that belongs together, and discovering that byte order is not universal.

Structures let you manipulate a complete object — a colour, a point, a player — rather than a handful of scattered variables. The day ends on a curiosity that always surprises: depending on the machine, the bytes of one and the same number are not stored in the same order.

Defining structures and unions, headers with macros, and colour manipulation with endianness swapping.