Java Program to Reverse a Number using Recursion

This is a Java Program to Find Reverse of a Number using Recursion.

Enter any integer number as an input. After that we count the number of digits in the given input. The given number along with length of that number is passed to the other function where by using recursion we get the reverse of a number as an output.

Here is the source code of the Java Program to Find Reverse of a Number using Recursion. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

```
import static java.lang.StrictMath.pow;
```
```
import java.util.Scanner;
```
```
public class Reverse_Recursion 
```
```
{
```

    public static void main(String[] args)

```
    {
```
```
        int n, count = 0, m;
```

        Scanner s = new Scanner(System.in);

        System.out.print("Enter the number:");

```
        n = s.nextInt();
```
```
        m = n;
```
```
        while(m > 0)
```
```
        {
```
```
            count++;
```
```
            m = m / 10;
```
```
        }
```

        Reverse_Recursion obj = new Reverse_Recursion();

```
        int a = obj.reverse(n, count);
```

        System.out.println("Reverse:"+a);

```
    }
```
```
    int reverse(int x, int length)
```
```
    {
```
```
        if(length == 1)
```
```
        {
```
```
            return x;
```
```
        }
```
```
        else
```
```
        {
```
```
            int b = x % 10;
```
```
            x = x / 10;
```

            return (int) ((b * pow(10, length - 1)) + reverse(x, --length));

```
        }
```
```
    }
```
```
}
```

Output:

$ javac Reverse_Recursion.java
$ java Reverse_Recursion
 
Enter the number:467
Reverse:764

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