Functions (reusable code blocks) in Intro to Computing - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a function in programming?

A function is a reusable block of code that performs a specific task. It helps avoid repeating the same code and makes programs easier to read and maintain.

beginner

Why do we use functions in programming?

Functions help by breaking a program into smaller parts, making it easier to understand, reuse, and test. They save time by avoiding repeated code.

beginner

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

A function definition is where you write the code for the function. A function call is when you use or run the function in your program.

intermediate

Explain the concept of input and output in functions.

Functions can take inputs (called parameters) to work with different data. They can also give back results (called return values) after processing.

beginner

How can you think of a function using a real-life analogy?

Think of a function like a coffee machine: you put in coffee beans and water (inputs), press a button (call the function), and get coffee (output). You can use the machine many times without making coffee from scratch each time.

What does a function do in a program?

A Stores data permanently

B Performs a specific task when called

C Repeats the same code multiple times

D Deletes parts of the program

A function performs a specific task when called, helping to organize and reuse code.

Which of these is a function call?

A greet()

B function greet

C def greet():

D return greet

greet() is a function call that runs the code inside the function named greet.

What do we call the values given to a function to work with?

A Variables

B Returns

C Loops

D Parameters

Parameters are the inputs given to a function to process.

Why is using functions helpful?

A It helps reuse code and organize programs

B It hides errors completely

C It slows down the program

D It makes the program longer

Functions help reuse code and organize programs, making them easier to manage.

What is the output of a function?

A The code inside the function

B The name of the function

C The result the function gives back after running

D The input values

The output is the result the function returns after processing the inputs.

Explain what a function is and why it is useful in programming.

Think about how functions help you write less code and keep things organized.

Describe the difference between a function definition and a function call with an example.

One is where you write the code, the other is when you use it.