Program code requests a user to enter a number then outputs the result as the number reversed. Say, the original number is 1234, the output will be 4321.

1. Using eclipse
   
2. import
   
   java.util.Scanner
   
   ;
   
3. 
   
4. public
   
   class
   
   ReverseNumber {
   
5. public
   
   static
   
   void
   
   main(
   
   String
   
   [
   
   ]
   
   args)
   
   {
   
6. System
   
   .out
   
   .println
   
   (
   
   "Please enter a number: "
   
   )
   
   ;
   
7. int
   
   number =
   
   new
   
   Scanner(
   
   System
   
   .in
   
   )
   
   .nextInt
   
   (
   
   )
   
   ;
   
8. 
   
9. int
   
   reversedNumber, i;
   
10. 
    
11. reversedNumber =
    
    0
    
    ;
    
12. i =
    
    0
    
    ;
    
13. 
    
14. while
    
    (
    
    number >
    
    0
    
    )
    
    {
    
15. /*this will get the remainder of the number which will be
    
16. *the rightmost digit
    
17. */
    
18. i =
    
    number %
    
    10
    
    ;
    
19. 
    
20. //this creates the reversed number
    
21. reversedNumber =
    
    reversedNumber *
    
    10
    
    +
    
    i;
    
22. 
    
23. 
    
24. //The result will be stored as an integer value
    
25. number =
    
    number/
    
    10
    
    ;
    
26. }
    
27. 
    
28. System
    
    .out
    
    .println
    
    (
    
    "The number reversed is: +reversedNumber);
    
29. }
    
30. }
    
31. 
    
32. Using a text editor & command prompt
    
33. import java.io.*;
    
34. 
    
35. class ReverseNumber{
    
36. public static void main(String args[]) {
    
37. try {
    
38. BufferedReader s =
    
39. new BufferedReader(new InputStreamReader(System.in));
    
40. int number, reversednumber, i;
    
41. 
    
42. System.out.print("
    
    Enter the number to be reversed:
    
    ");
    
43. number = Integer.parseInt(s.readLine());
    
44. 
    
45. i = 0;
    
46. reversednumber = 0;
    
47. 
    
48. while(number > 0){
    
49. i = number % 10;
    
50. reversednumber = reversednumber * 10 + i;
    
51. number = number/10;
    
52. }
    
53. System.out.print("
    
    The number reversed:
    
    " + reversednumber);
    
54. }
    
55. catch(IOException e){}
    
56. }
    
57. 
    
58. }
    

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