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C# Fundamentals · Variables & Data Types · Lesson 6 of 22

Constants with const

Concept

Constants with const

const declares a value that cannot change after it is set, useful for values like a fixed tax rate or maximum size.

By the end of this lesson
  • Explain the core idea behind Constants with const.
  • 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. 1. Read one concept.
  2. 2. Change the example.
  3. 3. Run, compare, and explain.
  4. 4. Complete the challenge below.
ExampleRunnable
const double TaxRate = 0.08;
Console.WriteLine(TaxRate);
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Constants with const. 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

Declare a const for a discount percentage and use it in a calculation.

Loading editor…

Console

Output will appear here...