How does the R repeat Loop work?

a) It continuously executes a block of code until a break condition is met

b) It iterates over a sequence of elements

c) It performs an operation once, regardless of conditions

d) It evaluates a condition at the end of each iteration

Answer:

a) It continuously executes a block of code until a break condition is met

Explanation:

The repeat loop in R is used to repeatedly execute a block of code until a specific condition is met and the loop is explicitly terminated with a break statement. Unlike other loops, a repeat loop does not have a predefined stopping point and relies on the programmer to include a break condition to exit the loop.

# Example of a repeat loop
i <- 1

repeat {
    print(i)
    i <- i + 1

    if (i > 5) {
        break
    }
}

# Output:
# [1] 1
# [1] 2
# [1] 3
# [1] 4
# [1] 5

In this example, the loop starts with i equal to 1 and continues until i becomes greater than 5. The break statement is used to exit the loop when this condition is met.

The repeat loop is useful when the number of iterations is not known in advance, and the loop should continue until a dynamically determined condition is met.