#include <array>
#include <cassert>
#include <iostream>

int main() {
    const unsigned long value = 0x12345678UL;
    const std::array<unsigned char, 4> bytes = {{
        static_cast<unsigned char>((value >> 24) & 0xffUL),
        static_cast<unsigned char>((value >> 16) & 0xffUL),
        static_cast<unsigned char>((value >> 8) & 0xffUL),
        static_cast<unsigned char>(value & 0xffUL)
    }};
    unsigned long restored = 0;
    for (unsigned char b : bytes) restored = (restored << 8) | b;
    assert(restored == value);
    assert(bytes[0] == 0x12 && bytes[3] == 0x78);
    std::cout << static_cast<unsigned>(bytes[0]) << ' '
              << static_cast<unsigned>(bytes[3]) << '\n';
}