Switch statement execution in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a switch statement in C#?

A switch statement allows you to choose between many options based on the value of a variable. It helps to run different code blocks depending on the value, making the code easier to read than many if-else statements.

beginner

How does the switch statement decide which case to execute?

The switch statement compares the value of the expression with each case label. When it finds a matching case, it executes the code inside that case until it hits a break or the end of the switch.

beginner

What happens if no case matches in a switch statement?

If no case matches, the code inside the default case runs if it exists. The default case acts like a fallback for any value not covered by other cases.

beginner

Why is the break statement important in a switch case?

The break statement stops the switch from running into the next case. Without break, the program continues executing the next cases, which can cause unexpected behavior.

intermediate

Can a switch statement in C# handle multiple cases with the same code?

Yes, you can list multiple case labels one after another without break statements between them. This way, all those cases run the same code block.

What keyword ends a case block in a C# switch statement to prevent fall-through?

A return

B continue

C break

D stop

The break keyword stops execution inside the switch and prevents running into the next case.

What happens if you omit the break statement in a switch case?

A The next case's code runs too

B The switch ends immediately

C The program throws an error

D The default case runs

Without break, execution continues into the next case, which is called fall-through.

Which case runs if no other case matches and a default case is present?

A The default case

B No case runs

C The last case

D The first case

The default case acts as a fallback when no other case matches.

Can a switch statement in C# use strings as case labels?

A No

B Yes

C Only with special syntax

D Only in newer versions

C# supports string values in switch case labels.

How do you group multiple cases to run the same code in a switch?

A Use if statements inside switch

B Use commas between case labels

C Use a special group keyword

D Write cases one after another without break

Listing cases consecutively without break groups them to run the same code.

Explain how a switch statement executes when given a value. Include what happens when a matching case is found and the role of break.

Think about how the program picks and runs one case among many.

Describe how you can handle multiple values with the same code block inside a switch statement.

Consider how to avoid repeating code for similar cases.