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Categories: Arrays. 2 Comments on Java program to reverse the array inplace

In this article we will learn to implement a Java program to reverse the array. A Java program is provided below which reverses an array in-place (without using extra memory).

 

Following program reads an array of elements and reverses the array in place i.e., without using any temporary array:

import java.util.Scanner;

public class Driver
{	
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		System.out.println("Enter the no. of elements: ");
		int n = input.nextInt();
		int a[] = new int[n];
		System.out.println("Enter " + n + " numbers:");
		for(int i = 0; i < n; i++)
			a[i] = input.nextInt();
		for(int i = 0, j = n - 1; i < j; i++, j--)
		{
			int temp = a[i];
			a[i] = a[j];
			a[j] = temp;
		}
		System.out.print("Reversed array is: ");
		for(int i = 0; i < n; i++)
			System.out.print(a[i] + " ");
		input.close();
	}
}

 

Input and output for the above program are as follows:

Enter the no. of elements: 
5
Enter 5 numbers:
1 2 3 4 5
Reversed array is: 5 4 3 2 1

 

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Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.

2 Comments

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Plz solve it
W. A. J. P. To print the value of 1/1+1/2+1/3+1/4+…….1/n

    int s=0;
    for (int i=0;i <=n;i++)
    {
    c=c+(1/i);
    }

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