Java Program to Check Katadrome Number

In the previous article, we have discussed Java Program to Check Tcefrep Number

In this article we will see how to check a number is a Katadrome number or not in Java programming language.

Java Program to Check Katadrome Number

Before going to the actual program, let’s first know what is a Katadrome Number.

Katadrome Number is a number whose digits are in decreasing digits.

Example:

Katadrome numbers:
4321 
432
21
210
2
1
3
Not Katadrome numbers:
123
6710
13
890

Let’s see different ways to check katadrome number.

By Using Static Value
By User Input Value
By User Defined Method

Approach:

Declare or take a number input.
Traverse all digits from right to left and check if any digit is smaller than previous. If smaller found then it is not katadrome number else it is a katadrome.

Method-1: Java Program to Check Katadrome Number By Using Static Value

import java.util.*;

public class Main
{
    public static void main(String[] args)
    {

        int number = 6541;
        // Method Called
        if (checkNumber(number))
            System.out.print(number+" is a Katadrome number");
        else
            System.out.print(number+" is not a Katadrome number");
    }
    
    // Method to check if a number is a Katadrome number or not
    static boolean checkNumber(int number)
    {
         
        // To store previous digit
        int previous = -1;
     
        // Traversing all digits from right to left 
        // and checking if any digit is smaller than previous.
        while (number > 0)
        {
            int digit = number % 10;
            number /= 10;
            if (digit < previous)
                return false;
            previous = digit;
        }
        return true;
    }
}

Output:

6541 is a Katadrome number

Method-2: Java Program to Check Katadrome Number By User Input Value

import java.util.*;

public class Main
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        //a number declared
        System.out.println("Enter a number:");
        int number = sc.nextInt();
        //Actualnumber assigned to atemp variable
        int temp=number;
        //flag valueinitialized as 1
        int flag=1;
            
         
        // To store previous digit
        int previous = -1;
        
        // Traversing all digits from right to left 
        // and checking if any digit is smaller than previous.
        while (number > 0)
        {
            int digit = number % 10;
            number /= 10;
            if (digit < previous)
                {
                flag=0;
                System.out.print(temp+" is not a Katadrome number");
                break;
                }
            previous = digit;
        }
        if(flag==1)
            System.out.print(temp+" is a Katadrome number");
    }
}

Output:

Case-1

Enter a number:65 
65 is a Katadrome number

Case-2

Enter a number:659
659 is not a Katadrome number

Method-3: Java Program to Check Katadrome Number By User Defined Method

import java.util.*;

public class Main
{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        int number = sc.nextInt();
        // Method Called
        if (checkNumber(number))
            System.out.print(number+" is a Katadrome number");
        else
            System.out.print(number+" is not a Katadrome number");
    }
    
    // Method to check if a number is a Katadrome number or not
    static boolean checkNumber(int number)
    {
         
        // To store previous digit
        int previous = -1;
     
        // Traversing all digits from right to left 
        // and checking if any digit is smaller than previous.
        while (number > 0)
        {
            int digit = number % 10;
            number /= 10;
            if (digit < previous)
                return false;
            previous = digit;
        }
        return true;
    }
}

Output:

Case-1

421 is a Katadrome number

Case-2

4261 is not a Katadrome number

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