generated from mwc/problemset_numberwords
70 lines
2.5 KiB
Python
70 lines
2.5 KiB
Python
# numberwords.py
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# --------------
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# By MWC Contributors
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# Functions to print out a verbal representation of an integer.
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MAXIMUM = 1000000
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DIGIT_NAMES = [
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"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"
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]
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TWEEN_AND_TEEN_NAMES = [
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"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"
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]
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TENS_NAMES = [
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"ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"
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]
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def int_under_1000000_to_str(number):
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"Returns a textual representation of the number."
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check_number_in_range(abs(number), 0, MAXIMUM)
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if number < 1000:
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return int_under_1000_to_str(number)
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else:
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thousands, hundreds = divide_with_remainder(number, 1000)
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thousands_text = int_under_1000_to_str(thousands)
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hundreds_text = int_under_1000_to_str(hundreds)
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return thousands_text + " thousand " + hundreds_text
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def int_under_1000_to_str(number):
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"Returns a textual representation of the number"
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check_number_in_range(number, 0, 1000)
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if number < 100:
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return int_under_100_to_str(number)
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else:
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hundreds, tens = divide_with_remainder(number, 100)
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hundreds_text = int_under_10_to_str(hundreds)
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tens_text = int_under_100_to_str(tens)
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return hundreds_text + " hundred and " + tens_text
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def int_under_100_to_str(number):
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check_number_in_range(number, 0, 100)
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tens, ones = divide_with_remainder(number, 10)
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if tens == 0:
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return int_under_10_to_str(number)
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elif tens == 1:
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return TWEEN_AND_TEEN_NAMES[ones]
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else:
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return TENS_NAMES[tens] + '-' + int_under_10_to_str(ones)
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def int_under_10_to_str(number):
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check_number_in_range(number, 0, 10)
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return DIGIT_NAMES[number]
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def check_number_in_range(number, minimum, maximum):
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"""Checks whether a number is at least minimum and less than maximum.
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Raises an error if the number is not in range.
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"""
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if number < minimum:
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raise ValueError(f"{number} must not be below {minimum}.")
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if number >= maximum:
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raise ValueError(f"{number} must be less than {maximum}.")
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def divide_with_remainder(dividend, divisor):
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"""Divides one number by another, using whole-number division.
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Returns the quotient and the remainder.
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Note how a function can return more than one value!
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"""
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quotient = dividend // divisor
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remainder = dividend % divisor
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return quotient, remainder
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