[EMAIL PROTECTED] wrote on
10/02/2008 01:06:29 PM:
> Hello,
>
> I am trying to do some exercises in John Zelle's book (chapter 4).
> I got stuck:
>
> "Write a program that finds the average of a series of numbers entered
> by the user. The program should first ask the user how many numbers
> there are. Note: the average should always be a float, even if the user
> inputs are all ints."
>
> Okay, I can ask how many number are to be added:
>
> numbers = input("How many number do you want me to calculate? ")
you should really use raw_input to get the info from the user, and
then convert it to a number.
numbers=int(raw_input("How many number do you want me to
calculate? "))
>
> If I then get a reply, say "5", what I would have to do next is to ask
> for the five numbers so that I can calculate the average.
Write the code like you knew it was going to be a 5 and then
replace anywhere the 5 appears with the variable 'numbers'.
> But given that I don't know the the value of 'numbers' ex ante, how
> could I ask for the right amount of numbers?
> I don't see how this can be achieved with the tools I have learned so
far...
Looking at the table of contents it looks like you should have
learned about loops by now.
> I am currently thinking along the lines of
>
> ans1, ans2 = input("Enter the numbers separated by a comma: ")
> average = (ans1 + ans2) / 2.0
have each number be its own input and repeat it depending on how
their input for numbers, and then do the averaging at the end.
>
> But as I say - I don't know how many assignment there have to be, nor do
> I know how Python could then create these assignments.
>
you don't need to keep the individual numbers only the sum, but if
you want to, use a list and append each new number to the end of the list.
> It would be great if someone could guide me towards the right track!!
>
> Thanks,
>
> David
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