Character (string) type in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a character string variable named greeting with the value "Hello".

R Programming

greeting <- [1]

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

A"Hello"

BHello

C'Hello'

DHello()

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string

Using a function call instead of a string

In R, character strings must be enclosed in double or single quotes. Here, double quotes are used.

2fill in blank

medium

Complete the code to find the number of characters in the string stored in word.

R Programming

length <- [1](word)

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Acount

Bsize

Clength

Dnchar

Attempts:

3 left

💡 Hint

Common Mistakes

Using length() which counts elements in a vector, not characters in a string

Using undefined functions like count() or size()

The nchar() function returns the number of characters in a string in R.

3fill in blank

hard

Fix the error in the code to concatenate two strings with a space between them.

R Programming

full_name <- paste(first_name, [1], last_name)

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

A""

B' '

C'_'

Dspace

Attempts:

3 left

💡 Hint

Common Mistakes

Using empty quotes which join strings without space

Using an undefined variable like space

To add a space between two strings in paste(), use a string with a space: ' '.

4fill in blank

hard

Fill both blanks to create a named vector with words as names and their lengths as values.

R Programming

word_lengths <- c([1] = nchar([2]))

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Aword

Bwords

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing singular and plural variable names

Using undefined variables

We use the variable word as the name and calculate its length with nchar(word).

5fill in blank

hard

Fill all three blanks to create a named vector of uppercase words with their lengths greater than 3.

R Programming

result <- c([1] = [2](word), nchar(word)[nchar(word) [3] 3])

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

Aword

Btoupper

C>

Dtolower

Attempts:

3 left

💡 Hint

Common Mistakes

Using tolower() instead of toupper()

Using wrong comparison operators like < or ==

The name is word, the function to uppercase is toupper, and the condition is > 3.