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 appropriate type of loop to use when we want the loop to execute at least once and continue looping until the test expression evaluates to false.

Step by step solution

List the common types of loops

There are primarily two types of loops in most programming languages - 'for' loops and 'while' loops. There is also a variation of the 'while' loop called the 'do-while' loop.

Discuss the 'for' loop

A 'for' loop is used when you know the number of times the loop should run. It contains an initialization statement, a test condition, and an increment/decrement statement, all within the loop's parentheses. The loop will run as long as the test condition is true. Example (in C++ language): ``` for(int i = 0; i < 5; i++){ cout << "Hello World!" << endl; } ```

Discuss the 'while' loop

A 'while' loop is used when you need to repeat a block of statements until a particular condition is met. The test expression is checked before the loop body is executed. If the test expression is false at the beginning, the loop body will not be executed at all. Example (in C++ language): ``` int i = 0; while(i < 5){ cout << "Hello World!" << endl; i++; } ```

Discuss the 'do-while' loop

A 'do-while' loop is like a 'while' loop, but with a crucial difference: the loop body is executed at least once, regardless of the test expression's initial value. The test expression is checked after the loop body is executed. If the test expression is false after the first iteration, the loop will not execute further. Example (in C++ language): ``` int i = 0; do{ cout << "Hello World!" << endl; i++; }while(i < 5); ```

Identify the appropriate loop for the given requirement

Given that we want the loop to execute at least once and repeat until the test expression is false, the 'do-while' loop is the most appropriate choice. This loop ensures that the block of statements inside the loop will be executed at least one time, meeting the requirement of the problem.

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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

Step by step solution

List the common types of loops

Discuss the 'for' loop

Discuss the 'while' loop

Discuss the 'do-while' loop

Identify the appropriate loop for the given requirement

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