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Thursday, 8 September 2016

Chapter 9 Exercise 13, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

9.13 (The Location class)
Design a class named Location for locating a maximal value and its
location in a two-dimensional array. The class contains public data
fields row, column, and maxValue that store the maximal value and its
indices in a two-dimensional array with row and column as int types and maxValue as a double type.
Write the following method that returns the location of the largest
element in a two-dimensional array:
public static Location locateLargest(double[][] a)
The return value is an instance of Location.
Write a test program that prompts the user to enter a two-dimensional
array and displays the location of the largest element in the array.


public class Location {

    public int row;
    public int column;
    public double maxValue;

    public Location(int row, int column, double maxValue) {
        this.row = row;
        this.column = column;
        this.maxValue = maxValue;
    }

    public static Location locateLargest(double[][] a) {

        int row = 0;
        int column = 0;
        double maxValue = a[row][column];

        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a[i].length; j++) {
                if (maxValue < a[i][j]) {
                    maxValue = a[i][j];
                    row = i;
                    column = j;
                }
            }
        }

        return new Location(row,column,maxValue);
    }


}
import java.util.Scanner;

public class Exercise_13 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        System.out.print("Enter the number of rows and columns in the array: ");
        int row = input.nextInt();
        int column = input.nextInt();
        double[][] m = new double[row][column];

        System.out.println("Enter the array:");
        for (int i = 0; i < m.length; i++) {
            for (int j = 0; j < m[i].length; j++) {
                m[i][j] = input.nextDouble();
            }
        }

        Location location = Location.locateLargest(m);

        System.out.println("The location of the largest element is "
                + location.maxValue + " at (" + location.row + ", " + location.column + ")");
    }

}

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