After inputting the number from the user, set a variable V to
zero. Loop over each digit from right to left and multiply V by
10, add the character code from the input and subtract the
character code for '0'. This is because '0'-'9' are consecutive
in the characterset, so '5'-'0'=5. For the hex output, loop over
V from left to right and get the byte value. Divide by 16 to get
the upper 4 bits. If the resulting value is between 0 and 9 then
add '0' and display the result. If the value is between 10 and
15 then add 'a' and subtract 10, and display the result. Then
get the byte value again and AND it with 15 to get the lower 4
bits, and display the value in the same way as the upper 4. For
the binary output, loop over V from left to right and get the
byte value Y. Initialise a bitmask variable B to 128 and AND
this with Y. If the result is zero, display '0', otherwise
display '1'. Divide B by 2 and repeat for the 6th binary digit.
Keep dividing B by 2 and displaying bits until B=0. Then go onto
the next byte val