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C# Fundamentals · Conditionals · Lesson 11 of 22

Logical Operators

Concept

Logical Operators

&&, ||, and ! combine multiple boolean conditions into a single expression to check.

By the end of this lesson
  • Explain the core idea behind Logical Operators.
  • 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
int age = 20;
bool hasId = true;
if (age >= 18 && hasId) {
    Console.WriteLine("Entry allowed");
}
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Logical Operators. 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 condition using || that checks if a number is negative or zero.

Loading editor…

Console

Output will appear here...