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 tells the caller what the function computed or decided.

beginner

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

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

intermediate

What happens if a function in C does not have a return statement?

If the function's return type is not void, missing a return statement can cause undefined behavior because the function does not send back a proper value.

intermediate

Can a function return multiple values directly in C?

No, C functions return only one value directly. To return multiple values, you can use pointers or structures.

beginner

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

The return type is void. It means the function performs actions but does not send any value back.

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

A send

B return

C output

D yield

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

What is the return type of a function that returns an integer?

A float

B void

C int

D char

The return type int means the function returns an integer value.

What happens if a function declared to return int does not have a return statement?

A Returns void

B Returns zero automatically

C Compiler error

D Undefined behavior

If a function declared to return int does not return a value, it causes undefined behavior.

Which return type means a function does not return any value?

A void

B int

C null

D none

The void return type means the function does not return any value.

How can a C function return multiple values?

A Using pointers or structures

B Using multiple return statements

C Using arrays as return type

D Using the return keyword multiple times

C functions can return multiple values by using pointers or structures.

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

Think about how functions communicate results back to the caller.

Describe how to handle returning multiple values from a function in C.

Remember C functions can only return one value directly.