alex prezmon - 10 months ago 76
Python Question

# python addition 2 digit number

I'm studying algorithms. The exercise consist in put a number of 2 digits (between 10 and 99) and then do the addition of the two digits. I made it in python and it works, but my teacher said that there's another way to do it without the conversions that i'm using. Can you help me? Is there a better way? Thanks.

``````for i in range(5):
num = input("Number: ")
num = int(num)
if num > 9 and num < 100:
num = str(num)
else:
print("It is not a two digit number.")
``````

I think he meant:

``````(num // 10) + (num % 10)
``````

With `num // 10` you perform an integer division with 10. But this is the first digit. With `num % 10` you get the remainder of the division, which is the second digit. For example:

``````>>> 67 // 10
6
>>> 67 % 10
7
``````

The most succinct way must be:

``````sum(divmod(num, 10))
``````

because `divmod` performs the integer division with 10 and finding the remainder at the same time. So with `sum` we get the sum of those two numbers. For example:

``````>>> divmod(67, 10)
(6, 7)
>>> sum(divmod(67, 10))
13
``````