Stephen's speech module is broken. This module is responsible for his number pronunciation. He has to click to input all of the numerical digits in a figure, so when there are big numbers it can take him a long time. Help the robot to speak easier and quicker to his friends by writing his speech module. All the words in the string must be separated by exactly one space character.
Input: Integer number from 0 to 999.
Output: A string representation of this number.
簡單來說，就是把輸入的數字轉換爲文字。
需要注意的問題主要是：
1.零的處理，在末尾的時候，0不需要念出來。這個問題用判斷是否整除來解決比較好，設置全局變量判斷是否進入遞歸是吃力不討好。
2.格式。每一個數字之間需要用空格隔開。
FIRST_TEN = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
SECOND_TEN = ["ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
OTHER_TENS = ["twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
HUNDRED = "hundred"
def checkio(number):
if number < 10:
return FIRST_TEN[number]
elif number >= 10 and number < 20:
return SECOND_TEN[number - 10]
elif number >= 20 and number < 100:
if number % 10 != 0:
return OTHER_TENS[number / 10 - 2] + " " + checkio(number % 10)
else:
return OTHER_TENS[number / 10 - 2]
else:
if number % 100 == 0:
return FIRST_TEN[number / 100] + " " + HUNDRED
else:
return FIRST_TEN[number / 100] + " " + HUNDRED + " " + checkio(number % 100)