>> Bart Lateur <[EMAIL PROTECTED]> writes: > > 18 9 > > 19 1 > > 20 2 > > How can one add two digits, and come up with a number larger than 18?
Sorry, my bad. I meant that as in "if the input string is 20 the output string is 2". At some point I kept thinking about this in terms of abcd -> abbccd -> xyz, where x=f(ab) and so on. -- Marcelo
