Why functions organize code in R Programming - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function named greet that prints a message.

R Programming

greet <- function() {
  print([1])
}

Drag options to blanks, or click blank then click option'

AHello, friend!

B"Hello, friend!"

Cprint("Hello, friend!")

Dmessage("Hello, friend!")

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the message

Putting print inside the string

The print function needs a string inside quotes to display the message.

2fill in blank

medium

Complete the code to call the greet function.

R Programming

[1]()

Drag options to blanks, or click blank then click option'

Agreet

Bprint

Cmessage

Dsay

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of the function name

Forgetting parentheses

To run the function, use its name followed by parentheses.

3fill in blank

hard

Fix the error in the function definition to accept a name parameter.

R Programming

greet <- function([1]) {
  print(paste("Hello," , name))
}

Drag options to blanks, or click blank then click option'

Atext

Bmessage

Cinput

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than inside the function

Forgetting to add a parameter

The function needs a parameter named 'name' to use it inside.

4fill in blank

hard

Fill both blanks to create a function that adds two numbers and returns the result.

R Programming

add_numbers <- function(a, b) {
  result <- a [1] b
  return([2])
}

Drag options to blanks, or click blank then click option'

A+

Bresult

C-

Da

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction instead of addition

Returning the wrong variable

The function adds a and b, then returns the result variable.

5fill in blank

hard

Fill all three blanks to create a function that checks if a number is positive, negative, or zero.

R Programming

check_number <- function(num) {
  if (num [1] 0) {
    return("Positive")
  } else if (num [2] 0) {
    return("Negative")
  } else {
    return([3])
  }
}

Drag options to blanks, or click blank then click option'

A>

B<

C"Zero"

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators

Returning a variable instead of a string for zero

The function uses > and < to check positive or negative, and returns "Zero" if neither.