R Programming MCQs with answers Page - 119

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Q. 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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Q. What will be the output of the following R code?
> x <- c("a", "b", "c", "d")
> for(i in 1:4) {
+ ## Print out each element of 'x'
+ print(x[i])
+ }

  • (A) [1] "a" [1] "b" [1] "c" [1] "d"
  • (B) [1] "c" [1] "b" [1] "a" [1] "d"
  • (C) [1] "d" [1] "c" [1] "b" [1] "a"
  • (D) Error

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Q. Point out the wrong statement?

  • (A) A formal argument can be a symbol, a statement of the form 'symbol = expression', or the special formal argument
  • (B) The first component of the function declaration is the keyword function
  • (C) The value returned by the call to function is not a function
  • (D) Functions are also often written when code must be shared with others or the public

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Q. What is the output of the following R code: for (i in 1:5) { if (i == 3) next; print(i) }

  • (A) 1, 2, 4, 5
  • (B) 1, 2, 3, 4, 5
  • (C) 2, 4
  • (D) 0, 1, 2, 3, 4

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Q. Which control structure in R is used to execute a block of code repeatedly until a condition is met?

  • (A) if-else loop
  • (B) for loop
  • (C) while loop
  • (D) do-while loop

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Q. In R, what is the purpose of the if-else statement?

  • (A) To execute a block of code if a condition is true, otherwise execute another block of code
  • (B) To create a loop that iterates a specified number of times
  • (C) To check multiple conditions sequentially
  • (D) To execute a block of code repeatedly until a condition is met

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Q. How is the switch() function used in R?

  • (A) To toggle between TRUE and FALSE values
  • (B) To switch the positions of two elements
  • (C) To select one of several alternatives
  • (D) To change the direction of a loop

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Q. In R, what is the syntax for the for loop?

  • (A) for (i in 1:10) { code_block }
  • (B) for (i = 1 to 10) { code_block }
  • (C) for (i = 1; i <= 10; i++) { code_block }
  • (D) for (i from 1 to 10) { code_block }

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Q. What is the purpose of the break statement in a loop in R?

  • (A) To exit the loop immediately
  • (B) To skip the current iteration of the loop
  • (C) To restart the loop from the beginning
  • (D) To increment the loop variable

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Q. How is a while loop different from a for loop in R?

  • (A) while loop is used for fixed iterations, for loop for variable iterations
  • (B) for loop is used for fixed iterations, while loop for variable iterations
  • (C) Both while and for loops are used for fixed iterations
  • (D) Both while and for loops are used for variable iterations

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