“while” loop: The “while” loop first checks its expression and then the statements inside the loop are executed. It is also called as pretest loops. These loops do not have to be terminated with a semicolon. With the false expressions, the loops can be terminated. So, the “while” loop always used for sentinel-controlled iteration. “do-while” loop: The “do-while” loops are called as posttest loops. The “do-while” loop does not check its expression till it has done iteration. This varies from the behavior of “while” loop. The “do-while” should be terminated with a semicolon (;). With the false expressions, the loops get terminated. The “do-while” loop make at-least single iteration even with the false expression.

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Chapter 5, Problem 3.1E

Program Plan Intro

“while” loop:

The “while” loop first checks its expression and then the statements inside the loop are executed. It is also called as pretest loops.

These loops do not have to be terminated with a semicolon.

With the false expressions, the loops can be terminated.

So, the “while” loop always used for sentinel-controlled iteration.

“do-while” loop:

The “do-while” loops are called as posttest loops. The “do-while” loop does not check its expression till it has done iteration. This varies from the behavior of “while” loop.

The “do-while” should be terminated with a semicolon (;). With the false expressions, the loops get terminated.

The “do-while” loop make at-least single iteration even with the false expression.

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