union.cpp

#include <cstdint>
#include <fmt/format.h>

int main()
{
	union {
 		uint32_t i;
		uint8_t a[4];
		struct { uint32_t lsb:6, m:20, msb:6; } b;
	};

	i = 0xFF02FF40;

	fmt::print("ARRAY:  "); for(int j=4;j>0;--j) fmt::print("{:08b}", a[j-1]); fmt::print("\n");
	fmt::print("INT:    {:032b}\n", i);
	fmt::print("FIELDS: {:06b}{:020b}{:06b}\n", b.msb, b.m, b.lsb);

	return 0;
}