getting the sum of digits in a number

[DDCane]

i made it like this:

def tvarsumman(n):
    if n<10:
        print n
    else:
        tvarsumman((n/10) + n%10)

but when it comes to 99 it does this

99--> 9+9=18-->1+8=9

thats wrong according to my professor.

can u help fix my function?

and all the ones u have made so far have been perfect! u are really helping me. thank u sir! :P

[DDCane]

one other small problem i have is i need to define a function that takes the number i put in splits it up and adds them together for example:

123 --> 1+2+3=6
88 --> 8+8=16

thanks for all ur help guys u are really saving my life!

[bartonc]

<snip>and one other small problem i have is i need to define a function that takes the number i put in splits it up and adds them together for example:

123 --> 1+2+3=6
88 --> 8+8=16

thanks for all ur help guys u are really saving my life!

Last things first (by the way, where my dict functions helpful?):

>>> user_input = '12345'
>>> numList = list(user_input)
>>> total = 0
>>> for num in numList:
...     try:  # prevent errors in the input from breaking the loop
...         total += int(num)
...     except (ValueError, TypeError):
...         pass  # do nothing
...     
>>> print total
15
>>> 

[bartonc]

i made it like this:

def tvarsumman(n):
    if n<10:
        print n
    else:
        tvarsumman((n/10) + n%10)

but when it comes to 99 it does this

99--> 9+9=18-->1+8=9

thats wrong according to my professor.

can u help fix my function?

and all the ones u have made so far have been perfect! u are really helping me. thank u sir! :P

You are welcome. I would not have guessed that English was not your first language. However, I am having some trouble following this.

[bartonc]

You are welcome. I would not have guessed that English was not your first language. However, I am having some trouble following this.

If recursion is not a requirement, then this may be what you are looking for:

>>> def SumDigits(n):
...     numList = list(str(n))
...     total = sum(int(c) for c in numList)
...     print total
...     
>>> SumDigits(99)
18
>>> 

[bartonc]

i made it like this:

def tvarsumman(n):
    if n<10:
        print n
    else:
        tvarsumman((n/10) + n%10)

but when it comes to 99 it does this

99--> 9+9=18-->1+8=9

thats wrong according to my professor.

can u help fix my function?

and all the ones u have made so far have been perfect! u are really helping me. thank u sir! :P

>>> def tvarsumman(n):
...     total = 0
...     while n > 0:
...         total += n%10
...         n /= 10
...     return total
...     
>>> print tvarsumman(99)
18
>>> print tvarsumman(123)
6
>>> 

[bvdet]

i made it like this:

def tvarsumman(n):
    if n<10:
        print n
    else:
        tvarsumman((n/10) + n%10)

but when it comes to 99 it does this

99--> 9+9=18-->1+8=9

thats wrong according to my professor.

can u help fix my function?

and all the ones u have made so far have been perfect! u are really helping me. thank u sir! :P

Using recursion, you need a way to terminate the function. You can do that by substituting 'print n' with 'return n'. The last line also needs a return, and n%10 needs to be outside of the argument list. Use divmod() to determine the integer quotient and remainder.

def tvarsumman(n):
    if n < 10:
        return n
    else:
        n, rem = divmod(n, 10)
        return tvarsumman(n) + rem

Example:

>>> tvarsumman(99)
18
>>> tvarsumman(12345)
15
>>> tvarsumman(987654321)
45
>>> tvarsumman(10135)
10
>>>

[Smygis]

Tjo! Gissar att du är svensk ;)
Och att du ska räkna ut tvärsumman med hjälp av en rekursiv funktion.

(Sorry about the language everyone else. And DDCane to if im wrong about his nationality, nothing realy important above)

Anyway:

def numsum(n):
    if n > 0:
        n = n % 10 + numsum(n/10)
    return n
 

Something like that?

[bartonc]

Tjo! Gissar att du är svensk ;)
Och att du ska räkna ut tvärsumman med hjälp av en rekursiv funktion.

Two Swedes on the boards! Very cool. My father was half Swedish, but I never learned the language.

(My apologies if I have mistaken your nationality)

[Smygis]

Two Swedes on the boards! Very cool. My father was half Swedish, but I never learned the language.

(My apologies if I have mistaken your nationality)

Nope, Youre entirely correct. I'm from Sweden.
I klicked report insted of reply :/ meh.

[DDCane]

Nope, Youre entirely correct. I'm from Sweden.
I klicked report insted of reply :/ meh.

Hey guys! Actually I'm American but I live in Sweden at the moment. Where in Sweden are from?

[Smygis]

Hey guys! Actually I'm American but I live in Sweden at the moment. Where in Sweden are from?

Up in the north. Live somewhere in the area around Umeå now.