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7. How many times will this loop run? What is the value of A after the last run? A=1; while A<18 A=2*A; end I recommend that you make up more of these for practice to check your knowledge of loops.

7. How many times will this loop run? What is the value of A after the last run? A=1; while A<18 A=2*A; end I recommend that you make up more of these for practice to check your knowledge of loops.

Database System Concepts
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
Section: Chapter Questions
Problem 1PE
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### 7. How many times will this loop run? What is the value of A after the last run? ```plaintext A = 1; while A < 18 A = 2 * A; end ``` ### Explanation Let's analyze the given code step-by-step to determine how many times the loop runs and what the final value of \( A \) is. 1. **Initial Value:** - `A` is initialized to 1 (`A = 1`). 2. **First Iteration:** - Condition: `A < 18` (1 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 1 = 2`. 3. **Second Iteration:** - Condition: `A < 18` (2 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 2 = 4`. 4. **Third Iteration:** - Condition: `A < 18` (4 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 4 = 8`. 5. **Fourth Iteration:** - Condition: `A < 18` (8 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 8 = 16`. 6. **Fifth Iteration:** - Condition: `A < 18` (16 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 16 = 32`. 7. **Termination:** - Condition: `A < 18` (32 < 18) is false, so the loop terminates. The loop runs 5 times, and the final value of `A` is 32. ### Recommendation I recommend that you make up more of these for practice to check your knowledge of loops.
Transcribed Image Text:### 7. How many times will this loop run? What is the value of A after the last run? ```plaintext A = 1; while A < 18 A = 2 * A; end ``` ### Explanation Let's analyze the given code step-by-step to determine how many times the loop runs and what the final value of \( A \) is. 1. **Initial Value:** - `A` is initialized to 1 (`A = 1`). 2. **First Iteration:** - Condition: `A < 18` (1 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 1 = 2`. 3. **Second Iteration:** - Condition: `A < 18` (2 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 2 = 4`. 4. **Third Iteration:** - Condition: `A < 18` (4 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 4 = 8`. 5. **Fourth Iteration:** - Condition: `A < 18` (8 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 8 = 16`. 6. **Fifth Iteration:** - Condition: `A < 18` (16 < 18) is true. - `A` is updated: `A = 2 * A` → `A = 2 * 16 = 32`. 7. **Termination:** - Condition: `A < 18` (32 < 18) is false, so the loop terminates. The loop runs 5 times, and the final value of `A` is 32. ### Recommendation I recommend that you make up more of these for practice to check your knowledge of loops.
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