Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
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Chapter 8, Problem 8.1PE

(Sum elements column by column) Write a method that returns the sum of all the elements in a specified column in a matrix using the following header:

public static double sumColumn(double[][] m, int columnIndex)

Write a test program that reads a 3-by-4 matrix and displays the sum of each column. Here is a sample run:

Chapter 8, Problem 8.1PE, (Sum elements column by column) Write a method that returns the sum of all the elements in a

Expert Solution & Answer
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Program Plan Intro

Sum of elements column by column

Program Plan:

  • Include the “Scanner” package to get input values from user.
  • Define the class named “Test”.
    • Define the main method.
      • Define the object “obj” for “Scanner” class to get input.
      • Declare the multi-dimensional array named “array”, and prompt the user to get array input.
      • Define the “for” loops, that get the input values for the variable “array”.
      • Define the “for” loop, that call the method “sumColumn()” with two arguments, they are array and index of array.
    • Define the method named “sumColumn()” with two arguments. One is a array variable “m” in type of “double” and another one is “columnIndex” with integer data type.
      • Declare the variable “total” in type of “double” and initialize the variable with “0”.
      • Set the “for” loop, the loop executes from “0” to length of array “m”.
        • Add the column values and store it into the “total”.
        • Return the value of “total”.
Program Description Answer

The following JAVA code is to sum the elements of array column by column using the method “sumColumn(double[][] m, int columnIndex)”.

Explanation of Solution

Program:

//Insert package

import java.util.Scanner;

//Class definition

public class Test

{

//Main method

public static void main(String[] args)

{

//Assign the object for "Scanner" class

Scanner obj = new Scanner(System.in);

//Print statement

System.out.print("Enter a 3 by 4 matrix row by row: ");

//Declaration of variable

double[][] array = new double[3][4];

//Outer loop

for (int i = 0; i < array.length; i++)

//Inner Loop

for (int j = 0; j <array[i].length; j++)

//Get input from user

array[i][j] = obj.nextDouble();

//Loop

for (int j = 0; j < array[0].length; j++)

{

//Print statement with function call

System.out.println("Sum of the elements at column " + j + " is " + sumColumn(array, j));     

}

}

//Function definition

public static double sumColumn(double[][] m, int columnIndex)

{

//Declaration of variable

double total = 0;

//Loop

for (int i = 0; i < m.length; i++)

//Add  the array values into variable

total += m[i][columnIndex];

//Return statement

return total;

}

}

Sample Output

Enter a 3 by 4 matrix row by row:

1.5 2 3 4

5.5 6 7 8

9.5 1 3 1

Sum of the elements at column 0 is 16.5

Sum of the elements at column 1 is 9.0

Sum of the elements at column 2 is 13.0

Sum of the elements at column 3 is 13.0

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Chapter 8 Solutions

Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)

Ch. 8.8 - Declare an array variable for a three-dimensional...Ch. 8.8 - Assume char[][][] x =new char[12][5][2], how many...Ch. 8.8 - Show the output of the following code: int[][][]...Ch. 8 - (Sum elements column by column) Write a method...Ch. 8 - (Sum the major diagonal in a matrix) Write a...Ch. 8 - (Sort students on grades) Rewrite Listing 8.2,...Ch. 8 - (Compute the weekly hours for each employee)...Ch. 8 - (Algebra: add two matrices) Write a method to add...Ch. 8 - (Algebra: multiply two matrices) Write a method to...Ch. 8 - (Points nearest to each other) Listing 8.3 gives a...Ch. 8 - (All closest pairs of points) Revise Listing 8.3,...Ch. 8 - Prob. 8.9PECh. 8 - (Largest row and column) Write a program that...Ch. 8 - (Game: nine heads and tails) Nine coins are placed...Ch. 8 - (Financial application: compute tax) Rewrite...Ch. 8 - (Locate the largest element) Write the following...Ch. 8 - (Explore matrix) Write a program that prompts the...Ch. 8 - (Geometry: same line ?) Programming Exercise 6.39...Ch. 8 - (Sort two-dimensional array) Write a method to...Ch. 8 - (Financial tsunami) Banks lend money to each...Ch. 8 - (Shuffle rows) Write a method that shuffles the...Ch. 8 - (Pattern recognition: four consecutive equal...Ch. 8 - Prob. 8.20PECh. 8 - (Central city) Given a set of cities, the central...Ch. 8 - (Even number of 1s) Write a program that generates...Ch. 8 - (Game: find the flipped cell) Suppose you are...Ch. 8 - (Check Sudoku solution) Listing 8.4 checks whether...Ch. 8 - Prob. 8.25PECh. 8 - (Row sorting) Implement the following method to...Ch. 8 - (Column sorting) Implement the following method to...Ch. 8 - (Strictly identical arrays) The two-dimensional...Ch. 8 - (Identical arrays) The two-dimensional arrays m1...Ch. 8 - (Algebra: solve linear equations) Write a method...Ch. 8 - (Geometry: intersecting point) Write a method that...Ch. 8 - (Geometry: area of a triangle) Write a method that...Ch. 8 - (Geometry: polygon subareas) A convex four-vertex...Ch. 8 - (Geometry: rightmost lowest point) In...Ch. 8 - (Largest block) Given a square matrix with the...Ch. 8 - (Latin square) A Latin square is an n-by-n array...Ch. 8 - (Guess the capitals) Write a program that...

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