R Programming Questions and Answers – Dates and Times

This set of R Programming Language Multiple Choice Questions & Answers (MCQs) focuses on “Dates and Times”.

1. _________ is an indication that a fatal problem has occurred and execution of the function stops.
a) message
b) error
c) warning
d) message & warning
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2. Point out the correct statement?
a) R has a number of ways to indicate to you that something’s not right
b) Executing any function in R may result in the condition
c) “condition” is a generic concept for indicating that something unexpected has occurred
d) All of the mentioned
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3. What would be the value of following R expression?

 log(-1)

a) Warning in log(-1): NaNs produced
b) 1
c) Null
d) 0
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4. Warnings are generated by the _________ function.
a) warning()
b) error()
c) run()
d) message()
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5. Point out the correct statement?
a) POSIX represents a portable operating system interface, primarily for UNIX systems
b) There are different levels of indication that can be used, ranging from mere notification to fatal error
c) The default input format for POSIX dates consists of the month, followed by the year and day, separated by slashes or dashes
d) R don’t have any way to indicate to you that something’s not right
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6. What will be the output of the following R code?

> printmessage <- function(x) {
+ if(x > 0)
+         print("x is greater than zero")
+ else
+         print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(1)

a) Error
b) Warning
c) Messages
d) 0
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7. To get the current date, the _______ function will return a Date object which can be converted to a different class if necessary.
a) Sys.Time
b) Sys.Date
c) Sys.DateTime
d) DateTime
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8. What will be the output of the following R code?

> printmessage <- function(x) {
+ if(x > 0)
+         print("x is greater than zero")
+ else
+         print("x is less than or equal to zero")
+ invisible(x)
+ }
> printmessage(NA)

a) Error
b) Warning
c) Messages
d) Null
View Answer

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