What return type should a function have if it does not return a value?

• A. int
• B. void
• C. bool
• D. double

Answer: (B)

When a function isn’t meant to produce a value, the return type should convey that no value is sent back. That’s why the best choice is a type that means “no value.” Using a non-void type like int, bool, or double would imply you must return a value of that type, and omitting a return value would be an error or undefined behavior in many languages.

Declaring a function with no return value communicates the intent clearly: the function does something—prints output, updates state, or performs actions—without handing a result to the caller. For example, a function declared as void logEvent(...) can run and finish without returning anything, simply ending at the closing brace. If you declared int, bool, or double, you’d be expected to return a value of that type; not doing so would violate the function’s contract.