Write a program to reverse digits of a number and String

Solution 1st: Reversing digits of a number - simplest solution
https://ide.geeksforgeeks.org/w1fALxIYWU

import java.io.*;
import java.util.*;

class GFG {
    public static void main (String[] args) {
        int input, output, remainder;
        output = 0;
   
        Scanner sc = new Scanner(System.in);
        input = sc.nextInt();
   
        while(input != 0){
            remainder = input % 10;
            output = (output * 10) + remainder;
            input = input/10;
        }
   
        System.out.println(output);
    }
}

Solution 2nd: Reversing digits of a number - Out of the Box
https://ide.geeksforgeeks.org/ppy5EQjEAR

import java.lang.*;
import java.io.*;
import java.util.*;

class GFG {
    public static void main (String[] args) {
        int input;
   
        Scanner sc = new Scanner(System.in);
        input = sc.nextInt();
   
        StringBuilder strInput = new StringBuilder();
        strInput.append(input);
        strInput = strInput.reverse();
   
        System.out.println(strInput);
    }
}

Also, see:


Solution 1st: Reversing string - simplest solution
https://ide.geeksforgeeks.org/DhdX10fH82

import java.lang.*;
import java.io.*;
import java.util.*;

class GFG {
    public static void main (String[] args) {
        String input, output="";
   
        Scanner sc = new Scanner(System.in);
        input = sc.nextLine();
   
        for(int i=input.length()-1 ; i >= 0 ; i--){
            output = output + input.charAt(i);
        }

        System.out.println(output);
    }
}

Solution 1st: Reversing string - alternate solution
https://ide.geeksforgeeks.org/QPY8JQQMR7

import java.lang.*;
import java.io.*;
import java.util.*;

class GFG {
    public static void main (String[] args) {
        StringBuilder input1 = new StringBuilder();
        String input ;
   
        Scanner sc = new Scanner(System.in);
        input = sc.nextLine();
   
        input1.append(input);
        input1 = input1.reverse();

        System.out.println(input1);
    }
}

Also, see:

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