Chapter 7. PC #16. 2D Array Operations JAVA ECLIPSE Write a program that creates

Question

Chapter 7. PC #16. 2D Array Operations

JAVA ECLIPSE

Write a program that creates a two-dimensional array initialized with test data. Use any primitive data type that you wish. The program should have the following methods:

• getTotal. This method should accept a two-dimensional array as its argument and return the total of all the values in the array.

• getAverage. This method should accept a two-dimensional array as its argument and return the average of all the values in the array.

• getRowTotal. This method should accept a two-dimensional array as its first argument and an integer as its second argument. The second argument should be the subscript of a row in the array. The method should return the total of the values in the specified row.

• getColumnTotal. This method should accept a two-dimensional array as its first argument and an integer as its second argument. The second argument should be the subscript of a column in the array. The method should return the total of the values in the specified column.

• getHighestInRow. This method should accept a two-dimensional array as its first argument and an integer as its second argument. The second argument should be the

subscript of a row in the array. The method should return the highest value in the specified row of the array.

• getLowestInRow. This method should accept a two-dimensional array as its first argument and an integer as its second argument. The second argument should be the subscript of a row in the array. The method should return the lowest value in the specified row of the array.

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I have an incomplete code looks like this:

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I need it to be able to produce these output.

Test Case 1

input1.txt

input2.txt

input3.txt

input4.txt

Test Case 2

input1.txt

input2.txt

input3.txt

input4.txt

Test Case 3

input1.txt

input2.txt

input3.txt

input4.txt

Test Case 4

input1.txt

input2.txt

input3.txt

input4.txt

Please help!

Command Line Arguments      Files in the same directory input1.txt

input1.txt

input2.txt

input3.txt

input4.txt

Explanation / Answer

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ArrayOpperation {
   public static void main(String[] args) throws FileNotFoundException {
       String fileName = args[0];

       File file = new File(fileName);

       if(file.exists()) {

           double [][] array = getArray(file);
           for(int row = 0; row < array.length;row++)
               System.out.printf("Row %d total: %f ", row, getRowTotal(array, row));
           for(int col = 0; col < array[0].length; col++)
               System.out.printf("Coulumn %d total: %f ", col, getColumnTotal(array, col));
       }else{
           System.out.printf("file %'s does not exist. , filename");

       }

   }

   public static double[][] getArray(File file) throws FileNotFoundException {
       int rows = 0;
       int columns = 0;

       Scanner inputFile = new Scanner(file);

       while (inputFile.hasNext()) {
           String line = inputFile.nextLine();

           if(rows == 0) {

               Scanner row = new Scanner(line);
               while (row.hasNext()) {
                   row.nextDouble();
                   columns++;
               }
               row.close();
           }

           rows++;
       }
       inputFile.close();

       double [][] result = new double [rows][columns];

       inputFile = new Scanner(file);

       for(int row = 0; row < rows; row++) {
           for(int col = 0; col < columns; col++) {
               result[row][col] = inputFile.nextDouble();
           }
       }

       inputFile.close();

       return result;
   }

   public static double getTotal(double [][] a) {
       int i,j,tot=0;
       for(i=0;i<a.length;i++)                                           //for each row
           for(j=0;j<a[0].length;j++)                                //for each column
               tot+=a[i][j];                                             //add the elements
       return tot;
   }

   public static double getAverage(double [][] a) {
       return (double)getTotal(a)/(a.length*a[0].length);
   }     
   public static double getRowTotal(double [][] a, int n) {
       int j;
       double tot=0;
       for(j=0;j<a[0].length;j++)
           tot+=a[n][j];
       return tot;
   }     
   public static double getColumnTotal(double [][] a, int n) {
       int j;
       double tot=0;
       for(j=0;j<a.length;j++)
           tot+=a[j][n];
       return tot;
   }   

   public static double getHighestInRow(double [][] a, int n) {
       int j;
       double max=a[n][0];
       for(j=0;j<a[0].length;j++)
           if(a[n][j]>max)
               max=a[n][j];
       return max;
   }     

   public static double getLowestInRow(double [][] a, int n) {
       int j;
       double low=a[n][0];
       for(j=0;j<a[0].length;j++)
           if(a[n][j]<low)
               low=a[n][j];
       return low;
   }
}

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