Monday, March 4, 2024
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Embarking on a 100-Day Adventure: Day 3 – Reverse An Array

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Greetings, Coders! Today, on Day 3 of our coding journey, we’re unraveling the art of array reversal in the simplest way possible. No fancy footwork, just straightforward magic of programming. Let’s dive in to the problem.

Question Statement:

Today, Your task is to write a program that Reverses all the elements in an integer Array.

Basically, if we were given an array with values of 1, 2, 3, 4, and 5. The goal is to flip it into the order 5, 4, 3, 2, 1.

Unlocking the Code:

Before you peek into the solution, please take 10-20 minutes and try to solve it to see if you can do it. It is these tiny struggles to try and understand the problem and try to find an approach that makes us stronger day by day.

Still unable to feel the essence of it? How about a hint?

Can you try it using an additional array that can store the values in reverse?

Okay. Now you know that you tried it well and might want to verify the problem or might still have some trouble understanding it, try to look into the solution and then attempt it from your end.

Example 1: Reversing An Array

public class ReverseAnArray {
public static void main(String[] args) {
int [] a = {1,2,3,4,5};
int [] rev = new int [a. length];
for(int i = 0; i< a.length; i++){
rev[i] = a[a.length -1 -i];
}
for(int v: rev){
System.out.println(v + "");
}
}
}

An array a is initialized with the elements 1, 2, 3, 4, and 5. Another array rev is created with the same length as array a to store the reversed elements. A for loop is used to iterate through each element of the original array a. The current element at index i is assigned to the corresponding position in the reversed array rev. The formula a.length -1-i calculates the reversed index.Another for loop is used to iterate through the reversed array rev. Each element v in the reversed array is printed to the console. Another for loop is used to iterate through the reversed array rev. Each element v in the reversed array is printed to the console.

Example 2: Swapping an Array

We initiate a loop that runs through the first half of the array. During each iteration, the elements at the beginning and end of the array swap places. This simple swap is accomplished using a temporary variable (temp).

public class SwappingAnArray {
public static void main(String[] args) {
int [] a = {1,2,3,4,5};
int n = a.length;
for(int i = 0; i< n/2; i++){
// Swap numbers from ith and (n-1-i)th position;
int temp = a[n-1-i];
a[n-1-i] = a[i];
a[i] = temp;
}
for( int v : a){
System.out.println(v + "");
}
}
}

Wrapping Up:

Array reversal is a fundamental coding challenge that unlocks insights into array manipulation and indexing. By understanding this simple code, you’ve taken a step closer to mastering arrays.

Ready to unlock more coding secrets? Stay tuned for our next adventure, and keep learning ! 💻✨

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