Flowchart

Loop

This structure allows you to repeat a task over and over. The red chart above on the left does the task and repeats doing the task until the condition is true.  The green chart on the right checks the condition first and does the task while the condition is true. It is not important that you remember whether the loop is a "Do While" or "Repeat Until" loop, only that you can check the condition at the start of the loop or at the end. You can also have the conditions reversed and your loop is still a structured design loop. A slight variation of the above is the "For each...do the following" loop shown below.