First R program in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the simplest way to print text in R?

Use the print() function with the text inside quotes, like print("Hello, world!").

beginner

What does the following R code do?<br>

print("Hello, world!")

It shows the text "Hello, world!" on the screen.

beginner

How do you write a comment in R?

Start the line with #. Anything after # is ignored by R.

beginner

What is the purpose of the print() function in R?

It shows information or results on the screen so you can see them.

beginner

Can you run R code directly in the console?

Yes! You can type R commands in the console and press Enter to see results immediately.

Which function prints text in R?

A echo()

B display()

C show()

D print()

The print() function is used to display text or values in R.

What will this code output?<br>

print("Hi there!")

A Error

B Hi there!

C print("Hi there!")

D "Hi there!"

The print() function shows the text without quotes around it.

How do you write a comment in R?

A # comment

B // comment

C <!-- comment -->

D /* comment */

In R, comments start with #.

What happens if you run print(123) in R?

A It prints the number 123

B It prints "123" as text

C It causes an error

D It prints nothing

Numbers can be printed directly using print().

Where can you type R commands to run them immediately?

A In a text editor

B In a web browser

C In the R console

D In a spreadsheet

The R console lets you type and run commands instantly.

Explain how to write and run your first R program that prints a message.

Think about how you tell R to show words on the screen.

Describe how comments work in R and why they are useful.

Comments are notes for people, not for the computer.