Oxford, Cambridge and RSA (OCR) GCSE Computer Science Paper 2 Practice

A DO WHILE loop is a type of iteration statement that executes the block of code at least once before checking the condition. This is a key characteristic that distinguishes it from other types of loops, such as the WHILE loop, which checks the condition before executing the code.

In a DO WHILE loop, the process is as follows: the code inside the loop runs first, and then the condition is evaluated. If the condition evaluates to true, the loop continues to execute; if false, the loop terminates. This ensures that the code block will always run at least one time, making it particularly useful for scenarios where an action needs to be performed initially, regardless of whether the condition is true or false at the start.

By focusing on the unique behavior of the DO WHILE loop, we understand its role in programming logic and how it can be advantageous in certain situations, such as when initial user input is required or when performing an action that must occur at least once.