Beginners Guide to R – R While Loop

`while` loop is used when you want to perform a task indefinitely, until a particular condition is met. It’s a condition-controlled loop.

Syntax

Here’s the syntax of the while statement:

Basic Examples

Any non-zero value or nonempty container is considered TRUE; whereas Zero, None, and empty container is considered FALSE.

``````# Iterate until x becomes 0
x <- 5
while (x) {
print(x)
x <- x - 1
}
[1] 5
[1] 4
[1] 3
[1] 2
[1] 1``````

If the condition is false at the start, the `while` loop will never be executed at all.

``````x <- 0
while (x) {
print(x)
x <- x - 1
}
``````

Break in while Loop

Python `break` statement is used to exit the loop immediately. It simply jumps out of the loop altogether, and the program continues after the loop.

``````# Break the loop when x becomes 3
x <- 6
while (x) {
print(x)
x <- x - 1
if (x == 3)
break
}
[1] 6
[1] 5
[1] 4``````

Next (continue) in while Loop

The `next` statement skips the current iteration of a loop and continues with the next iteration.

``````# Skip odd numbers using continue statement
x <- 6
while (x) {
x <- x - 1
if (x %% 2 != 0)
next
print(x)
}
[1] 4
[1] 2
[1] 0``````

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