Coursera - Python 3 Programming Specialization - Course 2 - Week 4 - 14.2. The while Statement

14_2_The-while-Statement.py

# Here is a new version of the summation program that uses a while statement.

def sumTo(aBound):
    """ Return the sum of 1+2+3 ... n """

    theSum  = 0
    aNumber = 1
    while aNumber <= aBound:
        theSum = theSum + aNumber
        aNumber = aNumber + 1
    return theSum

print(sumTo(4))

print(sumTo(1000))



# 1) Write a while loop that is initialized at 0 and stops at 15. If the counter is an even number, 
# append the counter to a list called eve_nums.

# Answer:

count = 0
eve_nums = []

while count <= 15:
    if count % 2 == 0:
        eve_nums.append(count)
    count = count + 1




# 2) Below, we’ve provided a for loop that sums all the elements of list1. 
# Write code that accomplishes the same task, but instead uses a while loop. 
# Assign the accumulator variable to the name accum.

# Answer:

list1 = [8, 3, 4, 5, 6, 7, 9]

tot = 0
for elem in list1:
    tot = tot + elem

index = 0
accum = 0
while index < len(list1):
    accum = accum + list1[index]
    index = index + 1