C# Fundamentals · Loops · Lesson 15 of 22
Looping Over Arrays
Concept
Looping Over Arrays
A foreach loop iterates over every element in an array or collection without manual indexing.
By the end of this lesson
- Explain the core idea behind Looping Over Arrays.
- 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.
ExampleRunnable
int[] nums = {1, 2, 3, 4};
foreach (int n in nums) {
Console.WriteLine(n);
}Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Looping Over Arrays. 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
Loop over an array of 5 integers and print their sum.
Loading editor…
Console