Review - Loops

Section 16.15 Review - Loops

Practice tracing for and while loops, predicting output, and writing loops for repetition.

Subsection 16.15.1 Part A: How Many Times?

Checkpoint 16.15.1.

Determine how many times each loop runs.

for i in range(5):
    print(i)

count = 0
while count < 3:
    print(count)
    count += 1

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Subsection 16.15.2 Part B: Trace the Loop

Checkpoint 16.15.2.

total = 0
for num in [2, 4, 6]:
    total = total + num

Trace the values of num and total at each iteration.

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Subsection 16.15.3 Part C: Predict the Output

Checkpoint 16.15.3.

What is printed by each loop?

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for ch in "cat":
    print(ch)

x = 1
while x <= 3:
    print(x)
    x += 1

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Subsection 16.15.4 Part D: Spot the Problem

Checkpoint 16.15.4.

count = 1
while count <= 5:
    print(count)

Explain what is wrong with this loop.

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Subsection 16.15.5 Part E: Create

Checkpoint 16.15.5.

Write a for loop that prints each value in the list [1, 2, 3, 4]. Write a while loop that prints the numbers 1 through 5. Then write a loop that counts how many letters are in the string "hello".

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Subsection 16.15.6 Think About ...

Checkpoint 16.15.6.

When is a for loop a better choice than a while loop?

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