Which of the following correctly initializes an array arr to...

Which of the following correctly initializes an array arr to contain four elements each with value 0? $I$ int [] arr $=\{0,0,0,0\}$ II int [] arr $=$ new int [4] III int [] arr $=$ new int [4] for (int $i=0 ; \text { i }<\text { arr. length; } i++)$ $\operatorname{arr}[\mathrm{i}]=0$ (A) I only (B) III only (C) I and III only (D) II and III only (E) I, II, and III

Which of the following correctly initializes an array arr to contain four elements each with value 0?
$I$ int [] arr $=\{0,0,0,0\}$
II int [] arr $=$ new int [4]
III int [] arr $=$ new int [4]
for (int $i=0 ; \text { i }<\text { arr. length; } i++)$ $\operatorname{arr}[\mathrm{i}]=0$
(A) I only
(B) III only
(C) I and III only
(D) II and III only
(E) I, II, and III

Key Concepts

Loop-Based Array Initialization

This concept involves using iteration, typically a for loop, to assign values to each element of an array after it has been created. This method is especially useful when a uniform operation must be applied to every element, or when dynamic calculation is needed for initialization.

Array Initialization Using Literal Syntax

This concept refers to the shorthand method to create and initialize an array at the same time by explicitly listing its values within curly braces. It provides a concise syntax, but it requires you to list each value, making it suitable for small or known sets of data.

Array Initialization Using the new Operator

This concept involves creating an array with a specified size using the new keyword. When an array of primitives is created this way in languages like Java, it is automatically filled with the default values for that type, which for integers is 0. This method is useful when the size is known but the individual elements do not need to be specified explicitly.

Default Values for Primitive Data Types

In programming languages such as Java, when an array is allocated using the new operator without explicit initialization, each element is automatically initialized to the default value of its type. For instance, numeric types default to 0, and boolean types default to false, ensuring that variables are not left with uninitialized or garbage values.

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