Words for Numbers

ID: wordsfornumbers

Difficulty: 2.6

CPU Time: 1 second

Memory: 1024 MB

Solution

For this, the actual lookup/conversion is more tedious/implementation-time than comprehension. An easy way (all things being relative) to do the lookup of a number if to take the ones' and tens' digits, and just do some enumeration from 0-10 for each of them, and figure out the two numbers (as words) they would be: "twenty, thirty, ..." for the tens, "one, two, ..." for the one's. After this matching, if the ones' digit == 0, then just return the tens' word; if the tens' digit is >= 2, return the tens concatenated with the ones by a hyphen; if the tens' digit is a zero, the ones' word can be returned. This leaves some hardcoding eleven to nineteen. Special cases (by this implementation) to check at the start are zero and ten.