I have this program that changes a number into words, but the problem is that when you have more than 16 digits in the number, it starts changing the numbers. This is done in Python 3 and we are wondering why this is happening and if there is a simple workaround? (We suspect that Python only handles 16 significant digits) Of course it could be a silly bug and in which case, I apologise... But we've had 3 sets of eyes on this and can't spot anything.
Any help is much appreciated.
digit1 = ["","one","two","three","four","five","six","seven","eight","nine"]
digit2 = ["","twenty","thirty","fourty","fifty","sixty","seventy","eighty","ninety"]
other = ["","thousand","million","billion","trillion","quadrillion","quintillion","sextillion","septillion","octillion","nonillion","decillion","undecillion","duodecillion","tredecillion","quattuordecillion","quindecillion","sexdecillion","septendecillion","octodecillion","novemdecillion","vigintillion","centillion"]
teens = ["","eleven","twelve","thirteen","fourteen","fifteen","sixteen","eighteen","nineteen"]
text = ""
number = input("Enter number: ")
try:
number = float(number)
except ValueError:
print ("That's not a number")
exit()
decimal = number
number = int(number)
def Num2Text(num):
out = ""
if len(num) >= 3:
out += digit1[int(num[0])] + " hundred "
if len(num) >= 2 and num[-2] != "1":
out += digit2[int(num[-2])-1] + " "
if len(num) >= 1 and num[-2] != "1":
out += digit1[int(num[-1])] + " "
if num[-2] == "1":
out += teens[int(num[-1])] + " "
return out
number = str(number)
cycles = len(number)/3
cycles = round(cycles+0.49)
for i in range(cycles,0,-1):
cnumber = str(int(decimal/1000**(i-1)))
cnumber = cnumber[-3:]
text += Num2Text(cnumber)
text += other[i-1] + " "
print(text)
