Chapter 8, Problem 8.1PE

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Answer 1

Question

Chapter 8, Problem 8.1PE

Expert Solution & Answer

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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3. Write two nested loops to generate the following output. (Note: There is one space between each number, and any extra line shown is intentional.) 12 10 8 6 18 15 12 24 20 30 2 3 3 6 48 12 5 10 15 20 6 12 18 24 30

Answer 2

Question

Chapter 8, Problem 8.1PE

Expert Solution & Answer

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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Answer 3

Question

Chapter 8, Problem 8.1PE

Expert Solution & Answer

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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Answer 4

Question

Chapter 8, Problem 8.1PE

Expert Solution & Answer

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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Answer 5

Expert Solution & Answer

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

Answer 6

Expert Solution & Answer

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

Answer 7

Expert Solution & Answer

Answer 8

Expert Solution & Answer

Answer 9

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”.

Answer 10

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)”.

Answer 11

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;

}

Answer 12

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

Answer 13

Chapter 8.2, Problem 8.2.1CP Chapter 8.2, Problem 8.2.2CP Chapter 8.2, Problem 8.2.3CP Chapter 8.2, Problem 8.2.4CP Chapter 8.3, Problem 8.3.1CP Chapter 8.3, Problem 8.3.2CP Chapter 8.4, Problem 8.4.1CP Chapter 8.5, Problem 8.5.1CP Chapter 8.6, Problem 8.6.1CP Chapter 8.7, Problem 8.7.1CP

Chapter 8, Problem 8.1PE

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