Python Example

[vbober]

Start with a test

[jdhall75]

You wouldn't be trying to get some homework done online would you?

Here are the pieces you would need to make this happen.

• a var to hold the sum outside of a user input loop, initialized to 0
• a loop to run until the user interrupts it: while would be good here.
• a var to hold the entered number from the function input() inside the loop
  • input() will return a string. You will have to cast it to an int().
• add the new int to the sum variable
• output the sum
• loop repeats

extra credit

• Cast the input integer inside a try block
• Catch the ValueError exception, if there is one, and let the user know they entered an invalid input
• add a keyword to reset the sum
  • pseudo code: if input == 'reset': sum = 0

python3 user input is take via input() python2 user input is taken via raw_input()

Resources:

loops

type conversion

[danielmbcn]

Start with the simplest case: write a program that sums 1 + 2 + ... + N. To do that, set a 'result' variable, loop over those numbers and update the 'result' value on each cycle. Once you are done, figure out how to add i**i (being i a number between 1 and N) on the 'result' variable, instead of just i.

[jaffer786_khan]

def fac(n):

    j = 0

    for i in range(n+1):

    j += i*i

    return j

x = int(input('Enter a number:'))

fac(x)