Return values in C++ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a return value in C++?

A return value is the result a function sends back to the part of the program that called it. It lets the function give information after finishing its task.

beginner

How do you specify the type of a return value in a C++ function?

You write the type before the function name. For example, int means the function returns an integer number.

intermediate

What happens if a function has a return type but no return statement?

If a function promises to return a value but does not use return, the program may behave unpredictably or cause an error.

intermediate

Can a function return multiple values directly in C++?

No, a function returns only one value directly. To return multiple values, you can use structures, classes, or output parameters.

beginner

What does the void return type mean?

It means the function does not return any value. It just performs actions without sending back a result.

What keyword is used to send a value back from a function in C++?

A return

B send

C output

D yield

The return keyword is used to send a value back from a function.

If a function is declared as int add(), what must it do?

A Return a string

B Return nothing

C Return an integer value

D Print output only

The function must return an integer value because its return type is int.

What is the return type of a function that does not return any value?

A int

B void

C null

D none

The void return type means the function returns no value.

Which of these can a C++ function return directly?

A One value

B Multiple values

C No values and multiple values

D Multiple values without any container

A function can return only one value directly.

What happens if a function with a non-void return type does not have a return statement?

A Returns zero automatically

B Returns a default string

C Returns void

D Undefined behavior or error

Not returning a value when expected causes undefined behavior or errors.

Explain what a return value is and why it is important in C++ functions.

Think about how functions share results with the rest of the program.

Describe how to handle returning multiple pieces of information from a C++ function.

Consider containers or references to send back more than one value.