Question

java

Write a recursive program to reverse a positive integer. . Your method should take a non negative integer as a parameter and return the reverse of the number as an integer. e.g. if you pass 12345, your method should return 54321.

Answer 1

THE PROGRAM ASKS TO RETURN THE REVERSE OF A NON NEGATIVE NUMBER.

Examples :

Input : num = 12345
Output : 54321

Input : num = 876
Output : 678

HERE IS A FLOWCHART DEPICTING TO FIND THE REVERSE OF THE NUMBER ---

HERE IS THE CODE I HAVE WRITTEN ON MY TERMINAL FOR REVERSING THE NUMBER ,THEN AFTER I HAVE PROVIDED WITH THE CODE AND THE OUTPUT AS IT IS :

Example:
num = 4562
rev_num = 0

rev_num = rev_num *10 + num%10 = 2
num = num/10 = 456

rev_num = rev_num *10 + num%10 = 20 + 6 = 26
num = num/10 = 45

rev_num = rev_num *10 + num%10 = 260 + 5 = 265
num = num/10 = 4

rev_num = rev_num *10 + num%10 = 265 + 4 = 2654
num = num/10 = 0

// Java program to reverse a number

// Java program to reverse digits of a number

// Recursive function to
// reverse digits of num
public class REVERSE_NUMBER
{
static int rev_num = 0;
static int base_pos = 1;
static int reversDigits(int num)
{
   if(num > 0)
   {
       reversDigits(num / 10);
       rev_num += (num % 10) * base_pos;
       base_pos *= 10;
   }
return rev_num;
}
   public static void main (String[] args)
   {
       int test;
       Scanner sc= new Scanner(System.in);
       System.out.println("Enter the number of times you want to test the code");
       test= sc.nextInt();
       for(int i=1;i<=test;i++)
       {
       int num =sc.nextInt(); ;
       System.out.println("Reverse of no. is "
                       + reversDigits(num));
       }
   }

OUTPUT AS IT APPRES ON MY SYSTEM:--

THANKs