Help printing the integers of a longer number
Jussi Piitulainen
jpiitula at ling.helsinki.fi
Thu Mar 28 13:03:49 EDT 2013
khaosyt at gmail.com writes:
> I want to print the individual numbers of a large number using
> division and modulus division.
>
> For example:
>
> Enter a positive integer: 54321
> 5
> 4
> 3
> 2
> 1
Those numbers are called the digits of the large number.
With divmod(54321, 10) you get both the number that is "left" after
removing the last digit, and the last digit:
>>> left, last = divmod(54321, 10)
>>> left
5432
>>> last
1
Define a function, print_digits(num), that prints the digits of the
non-negative integer num. Zero turns out fine so let's allow zero:
def print_digits(num):
left, last = divmod(num, 10)
if left < 0: print the digits of left
print(last)
How do you print the digits of left? With print_digits. Why does it
work? Because you only call print_digits again when left is closer to
zero than num.
It's called recursion.
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