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What is the difference between the when type cycle and the until type cycle? Many novices are not very clear about this. In order to help you solve this problem, the following small series will explain it in detail for everyone. Those who have this need can come to learn. I hope you can gain something.

The difference between a type loop and an until type loop is that the until type loop performs at least one operation.

In programming languages, repeated structures correspond to two types of loop statements. The structure of loop body after judgment is called when loop structure, also known as While loop. The loop structure that executes the loop body first and then judges is called the Until type loop structure, also known as the Until type loop. So the until-type loop performs at least one operation.

The cycle is one of the most basic cycle structures. When type loop refers to the loop structure that judges before the execution of the loop body, enters the loop when the condition is satisfied, otherwise ends the loop. When the loop structure is used to determine whether some condition is true and then repeat the execution of a piece of code.

The loop structure of the until type is to judge the control condition after executing the loop body once, execute the loop body when the condition is not satisfied, and stop when the condition is satisfied. The three elements of the structure are loop body, loop variable and loop termination condition. A complete cycle structure until the three elements are indispensable.

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