C# Fundamentals · Loops · Lesson 14 of 22
while Loops
Concept
while Loops
A while loop repeats as long as its condition stays true, useful when you don't know the exact number of iterations in advance.
By the end of this lesson
- Explain the core idea behind while Loops.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in while Loops. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Write a while loop that keeps doubling a number starting at 1 until it exceeds 100.
Need a nudge?
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
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