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Chapter 5: Problem 6

Which loop should you use in situations where you wish the loop to repeat until the test expression is false, but the loop should execute at least one time?

Short Answer

Expert verified
Answer: The 'do-while' loop is the most suitable choice in this scenario as it ensures that the loop body will execute at least once even if the test condition becomes false initially, and it continues to run as long as the test expression stays true.

Step by step solution

01

Understand the types of loops in programming

There are mainly three types of loops in programming: for loops, while loops, and do-while loops. Each has their own unique characteristics for handling different scenarios.
02

Analyze the 'for' loop

A 'for' loop is a control structure that repeatedly executes a block of code as long as a specified condition is true. The loop initializes an index variable, tests the condition, and then increments/decrements the index variable. If the test condition is false initially, then the loop will not execute even once. So, a 'for' loop may not fit the requirement in this situation.
03

Analyze the 'while' loop

A 'while' loop is a control structure that repeatedly executes a block of code as long as a specified condition is true. The test condition is checked before entering the loop body. If the test condition is false initially, the loop will not execute even once like in a 'for' loop. Therefore, a 'while' loop also does not fit the requirement in this situation.
04

Analyze the 'do-while' loop

A 'do-while' loop is a control structure that repeatedly executes a block of code as long as a specified condition is true. The test condition is checked after executing the loop body once, ensuring that the loop will always execute at least once, even if the test condition becomes false initially. This property of the 'do-while' loop makes it the best choice for the given situation.
05

Conclusion

In situations where you want the loop to execute at least once and continue running until the test expression becomes false, you should use the 'do-while' loop. It is specifically designed for such situations, as it guarantees that the loop body will run at least once.

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Most popular questions from this chapter

A(n) __________ is a variable that is initialized to some starting value, usually zero, and then has numbers added to it in each iteration of a loop.

$\mathrm{T} \mathrm{F} In a nested loop, the break statement only interrupts the loop it is placed in.

' characters. There should be \(15 \%\) characters in each row. # Write a nested loop that displays 10 rows of '#' characters. There should be \(15 \%\) characters in each row.

Inside the for loop’s parentheses, the first expression is the __________ , the second expression is the __________ , and the third expression is the __________.

\(\mathrm{T} \mathrm{F} \) All three of the for loop's expressions may be omitted.
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