Which type of iteration involves executing a block of code at least once before evaluating a condition?

The correct answer, which is the do-while loop, is defined by its unique structure that guarantees the execution of a code block at least once before evaluating any condition associated with it. This characteristic is what sets the do-while loop apart from other types of loops.

In a do-while loop, the block of code executes first, and after the execution, the condition is checked. If the condition evaluates to true, the loop continues to run; if it evaluates to false, the loop terminates. This means that even if the condition is false on the first evaluation, the block of code will still have been executed at least a single time. This is particularly useful in scenarios where the initial action must occur regardless of the condition that follows.

For example, if a program requires user input before checking whether the input meets a certain criterion, utilizing a do-while loop ensures that the input prompt is displayed at least once.

In contrast, other types of loops such as for loops and while loops do not guarantee at least one execution of their code block. A for loop iteratively executes a block of code a specified number of times, while a while loop checks the condition first, and if the condition is false initially, the block may not run