Chapter 30, Problem 30.1PE

Question

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Answer 1

Question

Chapter 30, Problem 30.1PE

Expert Solution & Answer

Program Plan Intro

Assign grades

Program Plan:

Import necessary packages into program.
Define the class named “Exercise30_01”.
- Define main method.
- Define the “Scanner” object “obj” for input.
- Prompt the user and get the number of students “N” from user.
- Declare the array variable “marks[]” in type of “double”.
- Prompt and get scores using “for” loop.
- Using “DoubleStream” class assign maximum value into “best” variable.
- Declare the “grade” in type of “character”.
- Using “for” loop which is execute from “0” to “marks.length”.
  - Using “if..elseif..else” condition, check the score value.
    - If the value greater than “best-10”, assign “A” to “grade”.
    - If the value greater than “best-20”, assign “B” to “grade”.
    - If the value greater than “best-30”, assign “C” to “grade”.
    - If the value greater than “best-40”, assign “D” to “grade”.
    - Otherwise, assign “E” to “grade”.
    - Print appropriate grade with statement on screen.

Program Description Answer

The following JAVA code is to calculate the grade of student scores using “DoubleStream”.

Explanation of Solution

Program:

/*Include necessary packages*/

import java.util.Scanner;

//Include Stream package

import java.util.stream.DoubleStream;

//Class definition

class Exercise30_01

{

//Main method

public static void main(String[] args)

{

/*Definition of "Scanner" object*/

Scanner obj = new Scanner(System.in);

/*Prompt the user for number of students*/

System.out.print("Enter number of students: ");

//Get input from user

int N = obj.nextInt();

/*Declaration and definition of array variable*/

double[] marks = new double[N];

//Prompt the user for marks

System.out.print("Enter " + N + " scores: ");

//Loop

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

{

/*Get scores and store into "marks[]" variable*/

marks[i] = obj.nextDouble();

}

/*Get maximum value using stream*/

double best = DoubleStream.of(marks).max().getAsDouble();

//Declaration of variable

char grade;

//Loop

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

{

/*Condition to check marks*/

if (marks[i] >= best - 10)

//Assign grade

grade = 'A';

/*Condition to check marks*/

else if (marks[i] >= best - 20)

//Assign grade

grade = 'B';

/*Condition to check marks*/

else if (marks[i] >= best - 30)

//Assign grade

grade = 'C';

/*Condition to check marks*/

else if (marks[i] >= best - 40)

//Assign grade

grade = 'D';

//Else statement

else

//Assign grade

grade = 'F';

//Print statement

System.out.println("Student " + i + " score is " +marks[i] + " and grade is " + grade);

}

Sample Output

Enter number of students: 4

Enter 4 scores: 40 55 70 58

Student 0 score is 40.0 and grade is C

Student 1 score is 55.0 and grade is B

Student 2 score is 70.0 and grade is A

Student 3 score is 58.0 and grade is B

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Answer 2

Question

Chapter 30, Problem 30.1PE

Expert Solution & Answer

Program Plan Intro

Assign grades

Program Plan:

Import necessary packages into program.
Define the class named “Exercise30_01”.
- Define main method.
- Define the “Scanner” object “obj” for input.
- Prompt the user and get the number of students “N” from user.
- Declare the array variable “marks[]” in type of “double”.
- Prompt and get scores using “for” loop.
- Using “DoubleStream” class assign maximum value into “best” variable.
- Declare the “grade” in type of “character”.
- Using “for” loop which is execute from “0” to “marks.length”.
  - Using “if..elseif..else” condition, check the score value.
    - If the value greater than “best-10”, assign “A” to “grade”.
    - If the value greater than “best-20”, assign “B” to “grade”.
    - If the value greater than “best-30”, assign “C” to “grade”.
    - If the value greater than “best-40”, assign “D” to “grade”.
    - Otherwise, assign “E” to “grade”.
    - Print appropriate grade with statement on screen.

Program Description Answer

The following JAVA code is to calculate the grade of student scores using “DoubleStream”.

Explanation of Solution

Program:

/*Include necessary packages*/

import java.util.Scanner;

//Include Stream package

import java.util.stream.DoubleStream;

//Class definition

class Exercise30_01

{

//Main method

public static void main(String[] args)

{

/*Definition of "Scanner" object*/

Scanner obj = new Scanner(System.in);

/*Prompt the user for number of students*/

System.out.print("Enter number of students: ");

//Get input from user

int N = obj.nextInt();

/*Declaration and definition of array variable*/

double[] marks = new double[N];

//Prompt the user for marks

System.out.print("Enter " + N + " scores: ");

//Loop

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

{

/*Get scores and store into "marks[]" variable*/

marks[i] = obj.nextDouble();

}

/*Get maximum value using stream*/

double best = DoubleStream.of(marks).max().getAsDouble();

//Declaration of variable

char grade;

//Loop

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

{

/*Condition to check marks*/

if (marks[i] >= best - 10)

//Assign grade

grade = 'A';

/*Condition to check marks*/

else if (marks[i] >= best - 20)

//Assign grade

grade = 'B';

/*Condition to check marks*/

else if (marks[i] >= best - 30)

//Assign grade

grade = 'C';

/*Condition to check marks*/

else if (marks[i] >= best - 40)

//Assign grade

grade = 'D';

//Else statement

else

//Assign grade

grade = 'F';

//Print statement

System.out.println("Student " + i + " score is " +marks[i] + " and grade is " + grade);

}

Sample Output

Enter number of students: 4

Enter 4 scores: 40 55 70 58

Student 0 score is 40.0 and grade is C

Student 1 score is 55.0 and grade is B

Student 2 score is 70.0 and grade is A

Student 3 score is 58.0 and grade is B

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Answer 3

Question

Chapter 30, Problem 30.1PE

Expert Solution & Answer

Program Plan Intro

Assign grades

Program Plan:

Import necessary packages into program.
Define the class named “Exercise30_01”.
- Define main method.
- Define the “Scanner” object “obj” for input.
- Prompt the user and get the number of students “N” from user.
- Declare the array variable “marks[]” in type of “double”.
- Prompt and get scores using “for” loop.
- Using “DoubleStream” class assign maximum value into “best” variable.
- Declare the “grade” in type of “character”.
- Using “for” loop which is execute from “0” to “marks.length”.
  - Using “if..elseif..else” condition, check the score value.
    - If the value greater than “best-10”, assign “A” to “grade”.
    - If the value greater than “best-20”, assign “B” to “grade”.
    - If the value greater than “best-30”, assign “C” to “grade”.
    - If the value greater than “best-40”, assign “D” to “grade”.
    - Otherwise, assign “E” to “grade”.
    - Print appropriate grade with statement on screen.

Program Description Answer

The following JAVA code is to calculate the grade of student scores using “DoubleStream”.

Explanation of Solution

Program:

/*Include necessary packages*/

import java.util.Scanner;

//Include Stream package

import java.util.stream.DoubleStream;

//Class definition

class Exercise30_01

{

//Main method

public static void main(String[] args)

{

/*Definition of "Scanner" object*/

Scanner obj = new Scanner(System.in);

/*Prompt the user for number of students*/

System.out.print("Enter number of students: ");

//Get input from user

int N = obj.nextInt();

/*Declaration and definition of array variable*/

double[] marks = new double[N];

//Prompt the user for marks

System.out.print("Enter " + N + " scores: ");

//Loop

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

{

/*Get scores and store into "marks[]" variable*/

marks[i] = obj.nextDouble();

}

/*Get maximum value using stream*/

double best = DoubleStream.of(marks).max().getAsDouble();

//Declaration of variable

char grade;

//Loop

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

{

/*Condition to check marks*/

if (marks[i] >= best - 10)

//Assign grade

grade = 'A';

/*Condition to check marks*/

else if (marks[i] >= best - 20)

//Assign grade

grade = 'B';

/*Condition to check marks*/

else if (marks[i] >= best - 30)

//Assign grade

grade = 'C';

/*Condition to check marks*/

else if (marks[i] >= best - 40)

//Assign grade

grade = 'D';

//Else statement

else

//Assign grade

grade = 'F';

//Print statement

System.out.println("Student " + i + " score is " +marks[i] + " and grade is " + grade);

}

Sample Output

Enter number of students: 4

Enter 4 scores: 40 55 70 58

Student 0 score is 40.0 and grade is C

Student 1 score is 55.0 and grade is B

Student 2 score is 70.0 and grade is A

Student 3 score is 58.0 and grade is B

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Answer 4

Question

Chapter 30, Problem 30.1PE

Expert Solution & Answer

Program Plan Intro

Assign grades

Program Plan:

Import necessary packages into program.
Define the class named “Exercise30_01”.
- Define main method.
- Define the “Scanner” object “obj” for input.
- Prompt the user and get the number of students “N” from user.
- Declare the array variable “marks[]” in type of “double”.
- Prompt and get scores using “for” loop.
- Using “DoubleStream” class assign maximum value into “best” variable.
- Declare the “grade” in type of “character”.
- Using “for” loop which is execute from “0” to “marks.length”.
  - Using “if..elseif..else” condition, check the score value.
    - If the value greater than “best-10”, assign “A” to “grade”.
    - If the value greater than “best-20”, assign “B” to “grade”.
    - If the value greater than “best-30”, assign “C” to “grade”.
    - If the value greater than “best-40”, assign “D” to “grade”.
    - Otherwise, assign “E” to “grade”.
    - Print appropriate grade with statement on screen.

Program Description Answer

The following JAVA code is to calculate the grade of student scores using “DoubleStream”.

Explanation of Solution

Program:

/*Include necessary packages*/

import java.util.Scanner;

//Include Stream package

import java.util.stream.DoubleStream;

//Class definition

class Exercise30_01

{

//Main method

public static void main(String[] args)

{

/*Definition of "Scanner" object*/

Scanner obj = new Scanner(System.in);

/*Prompt the user for number of students*/

System.out.print("Enter number of students: ");

//Get input from user

int N = obj.nextInt();

/*Declaration and definition of array variable*/

double[] marks = new double[N];

//Prompt the user for marks

System.out.print("Enter " + N + " scores: ");

//Loop

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

{

/*Get scores and store into "marks[]" variable*/

marks[i] = obj.nextDouble();

}

/*Get maximum value using stream*/

double best = DoubleStream.of(marks).max().getAsDouble();

//Declaration of variable

char grade;

//Loop

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

{

/*Condition to check marks*/

if (marks[i] >= best - 10)

//Assign grade

grade = 'A';

/*Condition to check marks*/

else if (marks[i] >= best - 20)

//Assign grade

grade = 'B';

/*Condition to check marks*/

else if (marks[i] >= best - 30)

//Assign grade

grade = 'C';

/*Condition to check marks*/

else if (marks[i] >= best - 40)

//Assign grade

grade = 'D';

//Else statement

else

//Assign grade

grade = 'F';

//Print statement

System.out.println("Student " + i + " score is " +marks[i] + " and grade is " + grade);

}

Sample Output

Enter number of students: 4

Enter 4 scores: 40 55 70 58

Student 0 score is 40.0 and grade is C

Student 1 score is 55.0 and grade is B

Student 2 score is 70.0 and grade is A

Student 3 score is 58.0 and grade is B

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Answer 5

Expert Solution & Answer

Program Plan Intro

Assign grades

Program Plan:

Import necessary packages into program.
Define the class named “Exercise30_01”.
- Define main method.
- Define the “Scanner” object “obj” for input.
- Prompt the user and get the number of students “N” from user.
- Declare the array variable “marks[]” in type of “double”.
- Prompt and get scores using “for” loop.
- Using “DoubleStream” class assign maximum value into “best” variable.
- Declare the “grade” in type of “character”.
- Using “for” loop which is execute from “0” to “marks.length”.
  - Using “if..elseif..else” condition, check the score value.
    - If the value greater than “best-10”, assign “A” to “grade”.
    - If the value greater than “best-20”, assign “B” to “grade”.
    - If the value greater than “best-30”, assign “C” to “grade”.
    - If the value greater than “best-40”, assign “D” to “grade”.
    - Otherwise, assign “E” to “grade”.
    - Print appropriate grade with statement on screen.

Program Description Answer

The following JAVA code is to calculate the grade of student scores using “DoubleStream”.

Explanation of Solution

Program:

/*Include necessary packages*/

import java.util.Scanner;

//Include Stream package

import java.util.stream.DoubleStream;

//Class definition

class Exercise30_01

{

//Main method

public static void main(String[] args)

{

/*Definition of "Scanner" object*/

Scanner obj = new Scanner(System.in);

/*Prompt the user for number of students*/

System.out.print("Enter number of students: ");

//Get input from user

int N = obj.nextInt();

/*Declaration and definition of array variable*/

double[] marks = new double[N];

//Prompt the user for marks

System.out.print("Enter " + N + " scores: ");

//Loop

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

{

/*Get scores and store into "marks[]" variable*/

marks[i] = obj.nextDouble();

}

/*Get maximum value using stream*/

double best = DoubleStream.of(marks).max().getAsDouble();

//Declaration of variable

char grade;

//Loop

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

{

/*Condition to check marks*/

if (marks[i] >= best - 10)

//Assign grade

grade = 'A';

/*Condition to check marks*/

else if (marks[i] >= best - 20)

//Assign grade

grade = 'B';

/*Condition to check marks*/

else if (marks[i] >= best - 30)

//Assign grade

grade = 'C';

/*Condition to check marks*/

else if (marks[i] >= best - 40)

//Assign grade

grade = 'D';

//Else statement

else

//Assign grade

grade = 'F';

//Print statement

System.out.println("Student " + i + " score is " +marks[i] + " and grade is " + grade);

}

Sample Output

Enter number of students: 4

Enter 4 scores: 40 55 70 58

Student 0 score is 40.0 and grade is C

Student 1 score is 55.0 and grade is B

Student 2 score is 70.0 and grade is A

Student 3 score is 58.0 and grade is B

Answer 6

Expert Solution & Answer

Program Plan Intro

Assign grades

Program Plan:

Import necessary packages into program.
Define the class named “Exercise30_01”.
- Define main method.
- Define the “Scanner” object “obj” for input.
- Prompt the user and get the number of students “N” from user.
- Declare the array variable “marks[]” in type of “double”.
- Prompt and get scores using “for” loop.
- Using “DoubleStream” class assign maximum value into “best” variable.
- Declare the “grade” in type of “character”.
- Using “for” loop which is execute from “0” to “marks.length”.
  - Using “if..elseif..else” condition, check the score value.
    - If the value greater than “best-10”, assign “A” to “grade”.
    - If the value greater than “best-20”, assign “B” to “grade”.
    - If the value greater than “best-30”, assign “C” to “grade”.
    - If the value greater than “best-40”, assign “D” to “grade”.
    - Otherwise, assign “E” to “grade”.
    - Print appropriate grade with statement on screen.

Program Description Answer

The following JAVA code is to calculate the grade of student scores using “DoubleStream”.

Explanation of Solution

Program:

/*Include necessary packages*/

import java.util.Scanner;

//Include Stream package

import java.util.stream.DoubleStream;

//Class definition

class Exercise30_01

{

//Main method

public static void main(String[] args)

{

/*Definition of "Scanner" object*/

Scanner obj = new Scanner(System.in);

/*Prompt the user for number of students*/

System.out.print("Enter number of students: ");

//Get input from user

int N = obj.nextInt();

/*Declaration and definition of array variable*/

double[] marks = new double[N];

//Prompt the user for marks

System.out.print("Enter " + N + " scores: ");

//Loop

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

{

/*Get scores and store into "marks[]" variable*/

marks[i] = obj.nextDouble();

}

/*Get maximum value using stream*/

double best = DoubleStream.of(marks).max().getAsDouble();

//Declaration of variable

char grade;

//Loop

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

{

/*Condition to check marks*/

if (marks[i] >= best - 10)

//Assign grade

grade = 'A';

/*Condition to check marks*/

else if (marks[i] >= best - 20)

//Assign grade

grade = 'B';

/*Condition to check marks*/

else if (marks[i] >= best - 30)

//Assign grade

grade = 'C';

/*Condition to check marks*/

else if (marks[i] >= best - 40)

//Assign grade

grade = 'D';

//Else statement

else

//Assign grade

grade = 'F';

//Print statement

System.out.println("Student " + i + " score is " +marks[i] + " and grade is " + grade);

}

Sample Output

Enter number of students: 4

Enter 4 scores: 40 55 70 58

Student 0 score is 40.0 and grade is C

Student 1 score is 55.0 and grade is B

Student 2 score is 70.0 and grade is A

Student 3 score is 58.0 and grade is B

Answer 7

Expert Solution & Answer

Answer 8

Expert Solution & Answer

Answer 9

Program Plan Intro

Assign grades

Program Plan:

Import necessary packages into program.
Define the class named “Exercise30_01”.
- Define main method.
- Define the “Scanner” object “obj” for input.
- Prompt the user and get the number of students “N” from user.
- Declare the array variable “marks[]” in type of “double”.
- Prompt and get scores using “for” loop.
- Using “DoubleStream” class assign maximum value into “best” variable.
- Declare the “grade” in type of “character”.
- Using “for” loop which is execute from “0” to “marks.length”.
  - Using “if..elseif..else” condition, check the score value.
    - If the value greater than “best-10”, assign “A” to “grade”.
    - If the value greater than “best-20”, assign “B” to “grade”.
    - If the value greater than “best-30”, assign “C” to “grade”.
    - If the value greater than “best-40”, assign “D” to “grade”.
    - Otherwise, assign “E” to “grade”.
    - Print appropriate grade with statement on screen.

Answer 10

Program Description Answer

The following JAVA code is to calculate the grade of student scores using “DoubleStream”.

Answer 11

Explanation of Solution

Program:

/*Include necessary packages*/

import java.util.Scanner;

//Include Stream package

import java.util.stream.DoubleStream;

//Class definition

class Exercise30_01

{

//Main method

public static void main(String[] args)

{

/*Definition of "Scanner" object*/

Scanner obj = new Scanner(System.in);

/*Prompt the user for number of students*/

System.out.print("Enter number of students: ");

//Get input from user

int N = obj.nextInt();

/*Declaration and definition of array variable*/

double[] marks = new double[N];

//Prompt the user for marks

System.out.print("Enter " + N + " scores: ");

//Loop

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

{

/*Get scores and store into "marks[]" variable*/

marks[i] = obj.nextDouble();

}

/*Get maximum value using stream*/

double best = DoubleStream.of(marks).max().getAsDouble();

//Declaration of variable

char grade;

//Loop

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

{

/*Condition to check marks*/

if (marks[i] >= best - 10)

//Assign grade

grade = 'A';

/*Condition to check marks*/

else if (marks[i] >= best - 20)

//Assign grade

grade = 'B';

/*Condition to check marks*/

else if (marks[i] >= best - 30)

//Assign grade

grade = 'C';

/*Condition to check marks*/

else if (marks[i] >= best - 40)

//Assign grade

grade = 'D';

//Else statement

else

//Assign grade

grade = 'F';

//Print statement

System.out.println("Student " + i + " score is " +marks[i] + " and grade is " + grade);

}

Answer 12

Sample Output

Enter number of students: 4

Enter 4 scores: 40 55 70 58

Student 0 score is 40.0 and grade is C

Student 1 score is 55.0 and grade is B

Student 2 score is 70.0 and grade is A

Student 3 score is 58.0 and grade is B

Answer 13

Chapter 30.1, Problem 30.1.1CP Chapter 30.2, Problem 30.2.1CP Chapter 30.2, Problem 30.2.2CP Chapter 30.2, Problem 30.2.3CP Chapter 30.2, Problem 30.2.4CP Chapter 30.3, Problem 30.3.1CP Chapter 30.3, Problem 30.3.2CP Chapter 30.3, Problem 30.3.3CP Chapter 30.3, Problem 30.3.4CP Chapter 30.3, Problem 30.3.5CP

Chapter 30, Problem 30.1PE

Explanation of Solution

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Chapter 30 Solutions