The case structure is a variation of the sequence structure and the do loop is a variation of the while loop.

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Quizplus · Accepted Answer

The case structure is not a variation of the sequence structure; it is a control flow statement that allows for multi-way branching. The do loop and while loop are both loop constructs, but the do loop ensures the loop body is executed at least once before the condition is tested, whereas the while loop tests the condition before executing the loop body.

The Case Structure Is a Variation of the Sequence Structure