Why loop control is required in Python - Challenge Your Understanding

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this loop with break?

Consider the following Python code that uses a loop control statement. What will be printed when this code runs?

Python

for i in range(5):
    if i == 3:
        break
    print(i)

A 0 1 2

B 0 1 2 3 4

C 0 1 2 3

D 1 2 3

💡 Hint

The break statement stops the loop immediately when the condition is met.

The loop prints numbers starting from 0. When i equals 3, the break stops the loop, so 3 is not printed.

❓ Predict Output

intermediate

What does continue do in this loop?

Look at this code using the continue statement. What numbers will be printed?

Python

for i in range(5):
    if i == 2:
        continue
    print(i)

A 0 1 2

B 0 1 2 3 4

C 2

D 0 1 3 4

💡 Hint

Continue skips the current loop cycle when the condition is true.

When i is 2, continue skips printing it. All other numbers from 0 to 4 are printed.

❓ Predict Output

advanced

What is the output of nested loops with break?

What will this nested loop print? Pay attention to where break is used.

Python

for i in range(3):
    for j in range(3):
        if j == 1:
            break
        print(f"{i},{j}")

A 0,0 1,0 2,0

B 0,0 0,1 1,0 1,1 2,0 2,1

C 0,0 1,0 2,0 0,1 1,1 2,1

D 0,0 1,0 2,0 0,1

💡 Hint

Break only stops the inner loop, not the outer loop.

For each i, j loops from 0 but breaks when j is 1, so only j=0 prints for each i.

❓ Predict Output

advanced

What happens if break is missing in this loop?

This code is supposed to stop when i reaches 3. What happens if we remove the break statement?

Python

for i in range(5):
    if i == 3:
        pass
    print(i)

A 0 1 2

B 0 1 2 3 4

C 0 1 2 3

D 0 1 2 4

💡 Hint

Pass does nothing and does not stop the loop.

Without break, the loop runs fully and prints all numbers from 0 to 4.

❓ Predict Output

expert

What is the output of this loop with else and break?

What will this code print? Notice the else block after the loop.

Python

for i in range(3):
    if i == 5:
        break
else:
    print('Loop ended normally')

A No output

B 0 1 2

C Loop ended normally

D 0 1 2 Loop ended normally

💡 Hint

The else block runs only if the loop is not stopped by break.

Since i never equals 5, break never runs, so else runs and prints the message.