Combination Function Help topic

On 12/02/2014 15:20, (E-Mail Removed) wrote:
> So I need to write a function based off of nCr, which I have here:
>
> def choices(n, k):
> if n == k:
> return 1
> if k == 1:
> return n
> if k == 0:
> return 1
> return choices(n - 1, k) + choices(n - 1, k - 1)
>
> It works fine, but then I need to add in so that the user can have an input box for n and k.
>
> def choices(n, k):
> if k == 1:
> return n
> if n == k:
> return 1
> if k == 0:
> return 1
> return choices(n - 1, k) + choices(n - 1, k - 1)
>
> n_input = int(input("Number of courses you like: "))
> k_input = int(input("Number of courses you can register for: "))
>
> The above doesn't return any value at all. And then I need it to print the total number of ways of choosing k out of n courses, which I only have:
>
> print ("Total number of ways of choosing %d out of %d courses: " % (n_input, k_input))
>
>
> So basically I need help figuring out why it won't return any value and how to print that final value.
>

Actually calling choices with n_input and k_input as inputs might help
your cause.

--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

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