Which of the following statements is true? OThe boolean test that make up the loop test is found in the body of the loop OThe key word while indicates the type of loop (pre-test) OThe loop body is indented at the same level as the key word while OThe boolean expression is followed immediately by the keyword end

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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### Question: Understanding While Loops

**Which of the following statements is true?** 
1. **The boolean test that makes up the loop test is found in the body of the loop.**
2. **The keyword while indicates the type of loop (pre-test).**
3. **The loop body is indented at the same level as the keyword while.**
4. **The boolean expression is followed immediately by the keyword end.**

---

**Explanation:**

When learning about loops, particularly the `while` loop, it's important to understand the structure and elements that constitute the loop. 

- **Statement 1:** This is *incorrect* because the boolean test in a while loop is not found in the body of the loop; it is found in the loop declaration.
  
- **Statement 2:** This is *true*. The keyword `while` indeed indicates a pre-test loop, meaning it evaluates the boolean expression before entering the loop body.

- **Statement 3:** This is *incorrect*. Typically, the loop body is indented to signify that it belongs to the loop block rather than being at the same level as the `while` loop declaration.

- **Statement 4:** This is *incorrect*. In most programming languages, the boolean expression in a `while` loop is followed by the loop body, not by a terminal keyword like `end`.

Understanding these key components helps better manage and utilize `while` loops in programming.
Transcribed Image Text:### Question: Understanding While Loops **Which of the following statements is true?** 1. **The boolean test that makes up the loop test is found in the body of the loop.** 2. **The keyword while indicates the type of loop (pre-test).** 3. **The loop body is indented at the same level as the keyword while.** 4. **The boolean expression is followed immediately by the keyword end.** --- **Explanation:** When learning about loops, particularly the `while` loop, it's important to understand the structure and elements that constitute the loop. - **Statement 1:** This is *incorrect* because the boolean test in a while loop is not found in the body of the loop; it is found in the loop declaration. - **Statement 2:** This is *true*. The keyword `while` indeed indicates a pre-test loop, meaning it evaluates the boolean expression before entering the loop body. - **Statement 3:** This is *incorrect*. Typically, the loop body is indented to signify that it belongs to the loop block rather than being at the same level as the `while` loop declaration. - **Statement 4:** This is *incorrect*. In most programming languages, the boolean expression in a `while` loop is followed by the loop body, not by a terminal keyword like `end`. Understanding these key components helps better manage and utilize `while` loops in programming.
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