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.