Question

This code loops until the user types in 17. It finds and prints the sum of all even numbers entered.

n = int(input("Enter a number, 17 to stop."))
sum = 0

while (n != 17):
if (n % 2 == 0):
sum = sum + n
n = int(input("Enter a number, 17 to stop."))

print("Sum: " + str(sum))

# This is an example of a(n) ____ loop.

# user input

Suppose you change the program so the user enters exactly 17 numbers.
The loop would then be an example of a(n) _____ loop

Answer 1

The provided code snippet is an example of a 'while' loop, which runs until the user inputs the number 17. If modified to run exactly 17 times regardless of input, it would illustrate a 'for' loop.

Step-by-step explanation:

The code provided demonstrates a loop structure that continues to execute as long as a certain condition is met. Specifically, this loop continues until the user types in the number 17. It checks if the number entered is even and if so, it adds that number to a total sum. This kind of loop is known as a while loop, because it repeatedly executes based on the persistence of a condition - in this case, the input not being 17.

If we were to modify this code to loop a fixed number of times, such as exactly 17 times, regardless of the input in each iteration, it would then become an example of a for loop. A for loop is used when the number of iterations is known beforehand, which contrasts with the while loop that continues based on a condition being true.