C# Fundamentals · Conditionals · Lesson 10 of 22
if / else if / else
Concept
if / else if / else
Conditionals run different blocks of code depending on whether a boolean expression evaluates to true.
By the end of this lesson
- Explain the core idea behind if / else if / else.
- 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 score = 85;
if (score >= 90) {
Console.WriteLine("A");
} else if (score >= 80) {
Console.WriteLine("B");
} else {
Console.WriteLine("C");
}Self-check before continuing
Without looking at the example, describe what changes when you modify one input in if / else if / else. 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 an if/else chain that prints "Pass" for scores 60 and above.
Loading editor…
Console