01 Average Numbers.md

Lab 01: Average Numbers

Version 1

We're going to average a list of numbers. Start with the following list, iterate through it, keeping a 'running sum', then divide that sum by the number of elements in that list. Remember len will give you the length of a list.

The code below shows how to loop through an array, and prints the elements one at a time.

nums = [5, 0, 8, 3, 4, 1, 6]

loop over the elements

for num in nums:
    print(num)

loop over the indices

for i in range(len(nums)):
    print(nums[i])

Version 2

Ask the user to enter the numbers one at a time, putting them into a list. If the user enters 'done', then calculate and display the average. The following code demonstrates how to add an element to the end of a list.

nums = []
nums.append(5)
print(nums)

Below is an example input/output:

> enter a number, or 'done': 5
> enter a number, or 'done': 3
> enter a number, or 'done': 4
> enter a number, or 'done': done
> average: 4