Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Attached is a question, using java.

**Rewriting a for Loop as a while Loop** **Original Code Using a for Loop:** ```cpp int sum = 0; int count = 0; for(int i = 1; i < 1048; i = i*2) { sum = sum + i; count++; } ``` In this code snippet, we use a `for` loop to sum the values of `i`, where `i` starts from 1 and is multiplied by 2 every iteration until it reaches 1048. Additionally, the `count` variable is incremented with each iteration to keep track of how many times the loop has executed. **Equivalent Code Using a while Loop:** ```cpp int sum = 0; int count = 0; int i = 1; // Initialize iterator variable outside of the loop while(i < 1048) { sum = sum + i; count++; i = i * 2; // Update the iterator variable inside the loop } ``` ### Explanation: 1. **Initial Setup**: Similar to the `for` loop, we initialize the variables `sum`, `count`, and `i` before entering the `while` loop. 2. **Loop Condition**: The `while` loop continues to execute as long as `i` is less than 1048. 3. **Inside the Loop**: Within the `while` loop, we: - Add the current value of `i` to `sum`. - Increment the `count` variable. - Multiply `i` by 2 to get the next value in the sequence. By making these adjustments, we achieve the same functionality as the original `for` loop using a `while` loop.
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Transcribed Image Text:**Rewriting a for Loop as a while Loop** **Original Code Using a for Loop:** ```cpp int sum = 0; int count = 0; for(int i = 1; i < 1048; i = i*2) { sum = sum + i; count++; } ``` In this code snippet, we use a `for` loop to sum the values of `i`, where `i` starts from 1 and is multiplied by 2 every iteration until it reaches 1048. Additionally, the `count` variable is incremented with each iteration to keep track of how many times the loop has executed. **Equivalent Code Using a while Loop:** ```cpp int sum = 0; int count = 0; int i = 1; // Initialize iterator variable outside of the loop while(i < 1048) { sum = sum + i; count++; i = i * 2; // Update the iterator variable inside the loop } ``` ### Explanation: 1. **Initial Setup**: Similar to the `for` loop, we initialize the variables `sum`, `count`, and `i` before entering the `while` loop. 2. **Loop Condition**: The `while` loop continues to execute as long as `i` is less than 1048. 3. **Inside the Loop**: Within the `while` loop, we: - Add the current value of `i` to `sum`. - Increment the `count` variable. - Multiply `i` by 2 to get the next value in the sequence. By making these adjustments, we achieve the same functionality as the original `for` loop using a `while` loop.
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