Modifying Arrays via Reference Arguments

In this problem, you will create a program that implements a doubleAll method to double each element of an array, and displays the array before and after modification to standard output.

Learning Objective: Understand the effect of modifying arrays through pass-by-reference

Overview

Modify an array inside a method and verify the effect on the caller.

Input Format

n
a1 a2 ... an

• Line 1: number of elements n
• Line 2: n space-separated integers

Specifications

• Define doubleAll(int[] numbers) method
• Double each element of the array
• Output the array before and after modification

Output Format

Before: a1 a2 ... an
After: b1 b2 ... bn