while-loops

While Loop Exercises

While loops continue executing as long as a condition remains True. They're perfect for situations where you don't know exactly how many iterations you need.

Key Concepts

Basic While Loop

while condition:
    # code to execute
    # don't forget to update the condition!

Common Patterns

• Countdown: while n > 0:
• Input validation: while not valid_input:
• Processing until condition: while more_data:
• Search until found: while not found:

Important: Avoid Infinite Loops

Always ensure the condition will eventually become False:

# Good - counter decreases
counter = 10
while counter > 0:
    counter -= 1

# Bad - infinite loop!
while True:
    print("This runs forever")

Tips

• Use break to exit early
• Use continue to skip to next iteration
• Consider if a for loop might be better
• Always have a plan for when the loop should end