This post contains a total of 11+ Hand-Picked Java Programs to Reverse a Number with Source Codes. All the programs are made using Java Programming Language.
You can use the source code of these programs for educational purpose with credits to the original owner.
Related Posts
Click a Code to Copy it.
1. By World Champion
Made by World Champion. Simple Java program to reverse a input number. ( Source )
Reverse of a number 1234 Reverse of the entered number 1234 is 4321
import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
//Enter a number
System.out.println("Reverse of a number ");
int n=s.nextInt();
int num,digit,reverse=0;
num=n;
while(n>0){
digit=n%10;
reverse=10*reverse+digit;
n/=10;
}
System.out.println("Reverse of the entered number "+num+" is "+reverse);
}
}2. By Nilesh
Made by Nilesh. Java program to reverse a integer. ( Source )
Your input is : 2345 After reversing :5432
import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int a = sc.nextInt();
System.out.println("Your input is : " + a);
int b,d=0;
while(a>0){
b=a%10;
a=a/10;
d=(d*10)+b;
}
System.out.println("After reversing :" +d);
}
}3. By ADITYA TIWARI
Made by ADITYA TIWARI. ( Source )
Enter A Number To Reverse 3456 6543
import java.io.*;
class Reverse
{
public static void main(String[] args)throws Exception
{
InputStreamReader a=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(a);
int n,r=0;
System.out.println("Enter A Number To Reverse");
n=Integer.parseInt(br.readLine());
while(n!=0)
{
r=r*10;
r=r+n%10;
n=n/10;
}
System.out.println(+r);
}
}4. By Muhd Khairul Amirin
Made by Muhd Khairul Amirin. ( Source )
Enter a number: 5674 After reverse: 4765
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Reverse
{
public static void main(String[] args) throws java.io.IOException
{
//enter a number
try{
int rev=0;
int a=Integer.parseInt(new BufferedReader(new InputStreamReader(System.in)).readLine());
int b=a;
while (a!=0){
rev=rev*10;
rev=rev+a%10;
a=a/10;
}
System.out.println("Enter a number: "+b+"\nAfter reverse: "+rev+"\n");}
catch(Exception e){
System.out.print("Enter a number");
}
}
}
5. By Shahid Iqbal
Made by Shahid Iqbal. Program to reverse a number using for loop. ( Source )
Enter You Number Buddy 4643 Reverse of the number: 4643 is = 3464
import java.util.*;
public class Program
{
public static void main(String[] args)
{
int rem,num,rev=0,myinput;
Scanner input = new Scanner(System.in);
System.out.println("Enter You Number Buddy");
num = input.nextInt();
myinput=num;
for(;num!=0;)
{
//this will gives us reminder
rem = num%10;
//this will add the num nd after *
rev = rev*10+rem;
//this will give us quotient
num = num/10;
}
System.out.println("Reverse of the number: "+myinput+" is = "+rev);
}
}6. By Miljan Stojanovic
Made by Miljan Stojanovic. ( Source )
Your number is: 4574 Reverse number is: 4754
import java.util.Scanner;
public class ReverseGivenNumber
{
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int number = in.nextInt();
System.out.printf("%-26s%d\n", "Your number is: ", number );
System.out.printf("%-25s ", "Reverse number is: ");
while(number>0)
{
int x = number % 10;
number /= 10;
System.out.print(x);
}
}
}7. By Ziv
Made by Ziv. This program gets input of Integer number from the user, returns its reversed order of digits their number. ( Source )
The No. you wrote: 1525 The reversed No. is: 5251 No. of digits: 4
import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner usPick = new Scanner(System.in);
int pick; //input from the user
int count = 1, down = count; //counters
try {
pick = usPick.nextInt(); //user pick
System.out.println("The No. you wrote: " + pick);
double m = pick;
System.out.print("The reversed No. is: ");
while (count >= down) {
if (Math.abs(m) >= 10) { //if the number contains more than one digit
int digit = (int)(m%10); //last digit equals to the remainder of 10
m/= 10; //devide by 10 to get the next digit each time
if (pick<0 && count>1) { //if the number is negative
digit*=-1;
}
down--; //counts down
count++; //counts the digits
System.out.print(digit);
} else { //for one digit number
if (pick<0) { //if the number is negative
m*=-1;
}
System.out.println((int)m); //last digit
down = count + 1; //Stop condition
}
}
System.out.println("No. of digits: " +count);
}
catch (Exception e) {
//input is not valid
System.out.println("Integer only!");
}
}
}8. By Looper🇮🇳
Made by Looper🇮🇳. Enter the number you want to reverse in int n=85952. ( Source )
Reverse Number is:25958 Number of digits is:5
public class Program
{
public static void main(String[] args) {
int n=85952,revNum=0,r,count=0;
while(n>0)
{
r=n%10;
revNum=(revNum*10)+r;
n=n/10;
count++;
}
System.out.println("Reverse Number is:"+revNum);
System.out.println("Number of digits is:"+count);
}
}9. By Sololearn
Made by Sololearn. Enter input in int number = 86732;. ( Source )
23768
public class Reverse
{
public static void main(String[] args)
{
int number = 86732; // sample number
int reverse = 0;
while (number > 0)
{
// use modulus operator to strip off the last digit and create the reversed number
reverse = reverse * 10 + number % 10;
number /= 10;
}
System.out.println(reverse);
}
}
10. By KODER999
Made by KODER999. ( Source )
5636 6365
/*
#20
validates the user input
#20
checks if the number is greater than 0 else the loop stops😀
#22
gets the remainder of the number when divided by 10
#23
prints the remainder
#24
reassigns the number
*/
import java.util.Scanner;
public class Program
{
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
//accept the number from the user
int number=scanner.nextInt();
if (number>0){
while (number>0){
int remainder=number%10;
System.out.print(remainder);
number=((number-remainder)/10);
}
}
}
}11. By Purab Gupta
Made by Purab Gupta. Enter any number of any length and get reverse of it. ( Source )
Entered number is 25525 Number after reversing is 52552 Hope you liked it !
import java.util.*;
public class Program
{
public static void main(String[] args) {
Scanner sc = new Scanner (System.in);
int a = sc.nextInt();
StringBuffer b=new StringBuffer(Integer.toString(a)).reverse();
System.out.println("Entered number is "+a);
System.out.println( "Number after reversing is "+b);
System.out.println("Hope you liked it !");
}
}12. By PurpleGirl
Made by PurpleGirl. ( Source )
123 321
import java.util.Scanner;
public class Reverse
{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
long m=sc.nextInt();
//int rem;
while(m>0){
long rem=m%10;
m=m/10;
System.out.print(rem);
}
}
}