Scaling a 2D array in Java

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heartin
Scaling a 2D array in Java

 

You are given a 2-Dimensional array (matrix) and a scale factor. You need to write a method to scale the array according to the scale factor. The signature of the method should be 

public static int[][] scale1(int[][] arr, int scale)

For example, if you are given a 2*3 array and scale factor is 3, the output array will be 6*9; the input and output arrays will be as follows:

Input

1 2 3 

4 5 6 

Output

1 1 1 2 2 2 3 3 3 

1 1 1 2 2 2 3 3 3 

1 1 1 2 2 2 3 3 3 

4 4 4 5 5 5 6 6 6 

4 4 4 5 5 5 6 6 6 

4 4 4 5 5 5 6 6 6 

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Arindam Ghosh
Solution to Scaling a 2D array in Java problem

package com.jee.heartin.problem;

import java.util.Scanner;

 

public class Scale2DArray {
   
    public static int[][] scaleArray(int[][] arr, int scale) {
        int[][] resultArr;
        int rowCount = 0;
        int columnCount = 0;
        boolean check = true;

        rowCount = arr.length;
        if (rowCount == 0)
            check = false;

        if (check) {
            columnCount = arr[0].length;

            System.out.println("Row count = " + rowCount);
            System.out.println("Column count = " + columnCount);

            int resultRow = rowCount * scale;
            int resultCol = columnCount * scale;

            resultArr = new int[resultRow][resultCol];

            int r = 0;
            int count = 0;
            int c;

            for (int i = 0; i < resultRow; i++) {
                c = 0;
                for (int j = 0; j < columnCount; j++) {
                    for (int k = 0; k < scale; k++) {
                        resultArr[i][c] = arr[r][j];
                        c++;
                    }
                }
                count++;
                if (count >= scale) {
                    r++;
                    count = 0;
                }

            }

            return resultArr;
        }

        else {
            System.out.println("Parent array does not have any element!!");
            return null;
        }

    }

 

    //Tester method
    public static void main(String[] args) {

        int[][] arr;

        Scanner scan = new Scanner(System.in);
        System.out.println("Enter the no. of rows for the 2D array : ");
        int r = scan.nextInt();
        System.out.println("Enter the no. of columns for the 2D array : ");
        int c = scan.nextInt();

        arr = new int[r][c];

        System.out.println("Enter the elements into the 2D array : ");
        for (int i = 0; i < r; i++) {
            for (int j = 0; j < c; j++) {
                System.out.print("Enter integer for row " + i + " col " + j
                        + ": ");
                arr[i][j] = scan.nextInt();
            }
        }
        System.out.println("The 2D array:");
        for (int i = 0; i < r; i++) {
            for (int j = 0; j < c; j++) {
                System.out.print(" " + arr[i][j]);
            }
            System.out.println("");
        }

        System.out.println("Enter the scale factor:");
        int scale = scan.nextInt();

        int[][] scaledArray = scaleArray(arr, scale);

        if (scaledArray == null) {
            System.out.println("The array cannot be scaled!!");
        } else {
            System.out.println("The resulting scaled array:");
            for (int i = 0; i < scaledArray.length; i++) {
                for (int j = 0; j < scaledArray[i].length; j++) {
                    System.out.print(" " + scaledArray[i][j]);
                }
                System.out.println("");
            }
        }
    }

}

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shams.tabrez.9
shams.tabrez.9's picture
 that was huge..........but

 that was huge..........but interesting !! thanx 

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