Function calling - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a function call in C?

A function call is when you ask a function to run its code by using its name followed by parentheses, optionally with arguments inside.

beginner

How do you call a function named printMessage in C?

You call it by writing printMessage(); with parentheses and a semicolon.

beginner

What happens if you call a function without the required arguments?

The program will give an error because the function expects certain inputs to work properly.

beginner

Why do we use function calls in a program?

Function calls let us reuse code, keep programs organized, and make the program easier to read and maintain.

intermediate

What is the difference between a function declaration and a function call?

A function declaration tells the program what the function looks like. A function call actually runs the function's code.

How do you call a function named sum that takes two integers in C?

A sum(5, 10);

B int sum(5, 10);

C call sum(5, 10);

D function sum(5, 10);

To call a function, just write its name with arguments inside parentheses followed by a semicolon.

What does a function call do?

A Comments out the function

B Runs the code inside the function

C Deletes the function

D Defines the function

A function call runs the code inside the function.

Which of these is a correct function call in C?

A myFunction();

B myFunction;

C myFunction()

D call myFunction();

A function call must have parentheses and end with a semicolon.

What happens if you forget parentheses when calling a function?

A The function runs normally

B The program skips the function

C The function is declared again

D You get a syntax error

Parentheses are required to call a function; missing them causes a syntax error.

Why do we pass arguments in a function call?

A To stop the function

B To name the function

C To give the function data it needs

D To declare the function

Arguments provide the function with the data it needs to work.

Explain in your own words what a function call is and why it is important in C programming.

Think about how you ask a friend to do something for you.

Describe the syntax of calling a function with and without arguments in C.

Remember the example: printMessage(); or sum(5, 10);