Java Program to Print Double Headed Arrow Number Pattern

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Print Double Headed Arrow Number Pattern

In the previous article, we have discussed Java Program to Print Hollow Diamond Number Pattern

In this article we are going to see how to print hollow diamond number pattern.

Example-1

When rows value = 5

         1
    2 1   1 2
3 2 1       1 2 3
    2 1   1 2
         1
Example-2:

When rows value=7

              1
        2 1   1 2
    3 2 1       1 2 3
4 3 2 1           1 2 3 4
    3 2 1       1 2 3
        2 1   1 2
              1

Now, let’s see the actual program to print it.

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Java Code to Print Double Headed Arrow Number Pattern

import java.util.Scanner;
class pattern
{

public static void main(String[] args)
{
    //Create a new Scanner object
    Scanner scan = new Scanner(System.in);

    //Taking total number of rows as input from user
    System.out.print("Rows : ");
    int rows= scan.nextInt();

    //Row and column are the iterators and counter to print
    int numberOfRows=1, numberOfColumns;

    // noValues is the number of values
    int noValues = 1;

    // noSpaces is the number of spaces
    int noSpaces = rows - 1;
    int noSpaces2 = -1;
    int val1 = numberOfRows;
    int val2 = 1;

    while (numberOfRows <= rows)
    {

        // Prints space
        //space is the count of spaces
        int space = 1;
        while (space <= noSpaces)
        {
            System.out.print("  ");
            space = space + 1;
        }

        //Prints number
        // countNum is the count of numbers to be printed
        int countNum1 = 1;
        while (countNum1 <= noValues)
        {
            System.out.print(val1+" ");
            val1 = val1 - 1;
            countNum1 = countNum1 + 1;
        }

        // Prints space
        //space is the count of spaces
        int space2 = 1;
        while (space2 <= noSpaces2)
        {
            System.out.print("  ");
            space2 = space2 + 1;
        }

        //Prints number
        // countNum is the count of numbers to be printed
        if (numberOfRows != 1 && numberOfRows != rows)
        {
            countNum1 = 1;
            while (countNum1 <= noValues)
            {
                System.out.print(val2+" ");
                val2 = val2 + 1;
                countNum1 = countNum1 + 1;
            }
        }
        System.out.println();

        //Goes to the next row
        if (numberOfRows <= rows / 2)
        {
            noValues = noValues + 1;
            noSpaces = noSpaces - 2;
            noSpaces2 = noSpaces2 + 2;
            val1 = numberOfRows + 1;
            val2 = 1;
        }
        else
        {
            noValues = noValues - 1;
            noSpaces = noSpaces + 2;
            noSpaces2 = noSpaces2 - 2;
            val1 = rows - numberOfRows;
            val2 = 1;
        }
        numberOfRows = numberOfRows + 1;
    }
}
}

Output::

Rows : 7

             1
        2 1   1 2
    3 2 1       1 2 3
4 3 2 1           1 2 3 4
    3 2 1       1 2 3
        2 1   1 2
             1

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