Question

I have an unsigned int value in

u_int_variable = 43981; // This is equal to ABCD in HEX

I can print this to console in hex as ABCD using

printf("Value in Hex is %X", u_int_variable);

// Output : Value in Hex is ABCD

How can I convert and separate this such that

unsigned char uhex, lhex;

uhex = 0xAB; and lhex = 0xCD;

Answer 1

uhex = static_cast<unsigned char>(u_int_variable >> 8);
lhex = static_cast<unsigned char>(u_int_variable & 0xFF);

Or, to be absolutely safe for >32 bit unsigned ints:

uhex = static_cast<unsigned char>((u_int_variable >> 8) & 0xFF);