R Programming Questions and Answers – Functions – 1

This set of R Programming Language Multiple Choice Questions & Answers (MCQs) focuses on “Functions – 1”.

1. Which of the following is apply function in R?
a) apply()
b) tapply()
c) fapply()
d) rapply()
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2. Point out the correct statement?
a) Writing functions is a core activity of an R programmer
b) Functions are often used to encapsulate a sequence of expressions that need to be executed numerous times
c) Functions are also often written when code must be shared with others or the public
d) All of the mentioned
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3. Functions are defined using the _________ directive and are stored as R objects.
a) function()
b) funct()
c) functions()
d) fun()
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4. What will be the output of the following R code?

> f <- function() {
+             ## This is an empty function
+ }
> f()

a) 0
b) No result
c) NULL
d) 1
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5. Point out the wrong statement?
a) Functions in R are “second class objects”
b) The writing of a function allows a developer to create an interface to the code, that is explicitly specified with a set of parameters
c) Functions provides an abstraction of the code to potential users
d) Writing functions is a core activity of an R programmer
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6. What will be the output of the following R code?

> f <- function() {
+              ## This is an empty function
+ }
> class(f)

a) “function”
b) “class”
c) “procedure”
d) “system”
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7. Which of the following R code will print “Hello, world!”?
a)

> f <- function() {
+              cat("Hello, world!\n")
+ }
> f()

b)

>  f <- function() {
+              cat("Hello, World!\n")
+ }
< f()

c)

> f <- function() {
+             cat("Hello world!\n")
+ }
>>= f()

d)

> f <- function() {
-             cat("Hello world!\n")
+ }
<= f()

8. What will be the output of the following R code?

> f <- function(num) {
+ for(i in seq_len(num)) {
+               cat("Hello, world!\n")
+ }
+ }
> f(3)

a)

Hello, world!
Hello, world!

b)

Hello, world!
Hello, world!
Hello, world!

c)

Hello, world!

d)

Hello, world!
Hello, world!
Hello, world!
Hello, world!

9. What will be the output of the following R code?

> f <- function(num) {
+ hello <- "Hello, world!\n"
+ for(i in seq_len(num)) {
+                    cat(hello)
+ }
+                    chars <- nchar(hello) * num
+                    chars
+ }
> meaningoflife <- f(3)
> print(meaningoflife)

a) 32
b) 42
c) 52
d) 46
View Answer

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