Worksheet:
Iteration (while loops)

import random

# use an accumulator pattern to track the total and the number of rolls

runningTotal:int = 0 # initialize to a starting value of 0

numRolls = 0 # initialize to a starting value of 0

# while we haven't reached 20

while runningTotal <= 20:

# roll the die

dieRoll:int = random.randint(1,6)

# accumulate into the number of rolls

numRolls += 1

# accumulate into the running total

runningTotal += dieRoll

# print the result

print( f"After {numRolls} rolls, the total is {runningTotal}.")

# Use a while loop to compute the squares of the numbers 1,2,3,... until the sum of the squares exceeds 1000.

# accumulator pattern

sum:int = 0 # initialize running sum to 0

currentValue:int = 1 # start the loop variable at 1

# while the sum hasn't exceeded 1000

while sum <= 1000:

# square the current value and add it to the sum

sum += currentValue*currentValue

# update the loop variable

currentValue += 1

print( f"The sum of the squares of the numbers from 1 to {currentValue - 1} is {sum}.")

# Use a while loop to prompt the user for a number and maintain a running product.

# Continue prompting for input until the use enters 0.

# accumulator pattern

product:int = 1 # initialize running product to 1

# loop variable for determining whether we continue

# let's make this a string type, since we know that is what the input function returns

# initialize by prompting the user for a value

userInput:str = input( "Please enter a number or 0 to quit: " )

# while the user's input is not "0"

while userInput != "0":

# turn the input to a number

userNum:float = float(userInput)

# multiply into the running product

product *= userNum

# update the loop variable by prompting the user to enter a value

userInput = input( "Please enter a number or 0 to quit: " )

print( f"The product of all your numbers is {product}.")