Answered: Java The following code was not…

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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Question

Java

The following code was not exactly explained how the list[i] = list[i-1] *2 works. Can you give me a iteration step by step how the output is calculated. ie if the 1st iteration is 0 then how was it calculated? ie is it (1-1)*2?

public class TestTwo
{
public static void main(String[] args)
{
int[] list = {1,2,3,4,5,6};
for(int i = 1; i < list.length; i++)
{
list[i] = list[i - 1] * 2;
}
for(int i = 0; i < list.length; i++)
{
System.out.print(list[i] + " ");
}
}

}

Expert Solution

Step 1: Explanation

Output of the given code is,

Explanation:

"list" is an one dimensional array and it is initialized with the values "{1,2,3,4,5,6}".
The first "for" loop is iterated for the "i" values from "1" through length of the array-1, which is "5".
The body of first "for" loop contains the statement "list[i] = list[i - 1] * 2;"
When i=1,

$list [1] = list [1 - 1] * 2 = list [0] * 2 We know that list [0] = 1 So, list [1] = 1 * 2 = 2$

When i=2,

$list [2] = list [2 - 1] * 2 = list [1] * 2 We know that list [1] = 2 So, list [2] = 2 * 2 = 4$

When i=3,

$list [3] = list [3 - 1] * 2 = list [2] * 2 We know that list [2] = 4 So, list [3] = 4 * 2 = 8$

When i=4,

$list [4] = list [4 - 1] * 2 = list [3] * 2 We know that list [3] = 8 So, list [4] = 8 * 2 = 16$

When i=5,

$list [5] = list [5 - 1] * 2 = list [4] * 2 We know that list [4] = 16 So, list [5] = 16 * 2 = 32$

The second "for" loop is iterated for the "i" values from "0" through length of the array-1, which is "5".
The body of second "for" loop contains the statement "System.out.print(list[i] + " ");", it prints the updated value of array "list" on the screen.
When i=0, the value of "list[0]" and a space are printed on the screen, and the value of "list[0]" is "1" from the given array.
When i=1, the value of "list[1]" and a space are printed on the screen, and the value of "list[1]" is "2".
When i=2, the value of "list[2]" and a space are printed on the screen, and the value of "list[2]" is "4".
When i=3, the value of "list[3]" and a space are printed on the screen, and the value of "list[3]" is "8".
When i=4, the value of "list[4]" and a space are printed on the screen, and the value of "list[4]" is "16".
When i=5, the value of "list[5]" and a space are printed on the screen, and the value of "list[5]" is "32".

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