Conversión de números a su forma escrita y dentro de lo posible a números romanos y expresiones fraccionarias.
Convert any positive number from 0 up to 999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999.999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999 to its Spanish written form and, whenever possible, express the number in Roman numerals and/or fractions
This is, probably, the first meaningful code I ever wrote. Originally written on a Commodore 64, back in 1987.