Converts binary 110111011 to hexasecimal.

You can convert too hex from binary by grouping, from the right, four digits at a time:

1 1011 1011
and convert each group from binary to a decimal digit, using A for 10, B for 11...and F for 15.
For example, 1011=> 8+0+2+1=11=>B
so the above example becomes
1BB in hex.