The three attributes of a test after loop are present. Output "Do you want to try it again? y or n " ![]() It is also sometimes called a post-test loop, meaning the test is post (or Latin for after) the action and update. It is called a “test after loop” because the test comes after the action. Notice, because this is a test after loop the action will always happen at least once. When the test expression becomes true, you stop the loop and go on with the next item in the program. The English phrasing is, “You repeat the action until the expression becomes true”. Within the repeat until control structure, there are three attributes of a properly working loop. Let’s rewrite the structure to consider this: repeat ![]() The Boolean data type has two values – true and false. In most programming languages the question (called a test expression) is a Boolean expression. Until the answer to the question becomes true The basic form of the repeat until loop is as follows: repeat The term loop comes from the circular looping motion that occurs when using flowcharting. Like all control structures, we ask a question to control the execution of the loop. The concept of iteration is connected to possibly wanting to repeat an action. Understanding Iteration in General – repeat until It is called a test after loop because the test comes after the action. When the test expression is false, you stop the loop and go on with the next item in the program. The English phrasing is, “You do the action while the expression is true”. Within the do while control structure there are three attributes of a properly working loop. Let’s rewrite the structure to consider this: do The basic form of the do while loop is as follows: do Understanding Iteration in General – do while There are two commonly used test after loops in the iteration (or repetition) category of control structures. Discussion Introduction to Test After Loops For example, the Pascal language has a repeat until loop, which continues to run until the control expression is true (and then terminates) - whereas a “while” loop runs while the control expression is true (and terminates once the expression becomes false). Some languages may use a different naming convention for this type of loop. Kenneth Leroy Busbee and Dave Braunschweig OverviewĪ do while loop is a control flow statement that executes a block of code at least once, and then repeatedly executes the block, or not, depending on a given boolean condition at the end of the block.
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