What is the difference between when loop and until loop?

What is the difference between when loop and until loop?

The difference between when-type loop and until-type loop is that "until-type loop performs at least one operation".

In programming languages, repeated structures correspond to two types of loop statements. The structure that first judges and then executes the loop body is called a while loop structure, also known as a while loop. The loop body is executed first and then judged, which is called the until loop structure, also known as the Until loop. So the until loop performs at least one operation.

The loop is one of the most basic loop structures. When-type loop refers to a loop structure that is judged before the loop body is executed. When the condition is met, the loop is entered, otherwise the loop is terminated. The type loop structure is used when it first determines whether certain conditions are true, and then repeatedly executes a certain section of code.

The until-type loop structure first executes the loop body once, and then judges the control conditions. When the conditions are not met, the loop body is executed, and when it is met, it stops. The three elements of the until structure are the loop body, the loop variable, and the loop termination condition. These three elements are indispensable for a complete until-type loop structure.

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