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How do I fix the result? import java.lang.*; import java.util.Scanner; // import the Scanner class public class Main { public static Scanner keyboard = new Scanner(System.in); public static void main(String[] args) { boolean doItAgain = false; do { doItAgain = false; calcType(); System.out.println("Do you want to start over? (Y/N)"); //Scanner keyboard = new Scanner(System.in); String decision = keyboard.next(); if(decision.equals("Y")) { doItAgain = true; } } while(doItAgain); System.out.println("Goodbye"); } public static void calcType() { String mode; System.out.println("Enter the calculator mode: Standard/Scientific?"); //Scanner keyboard = new Scanner(System.in); mode = keyboard.next(); if(mode.equals("Standard")) { standard(); } else if (mode.equals("Scientific")) { scientific(); } else System.out.println("Unknown calculator type: " + mode); } public static void standard() { System.out.println("The calculator will operate in standard mode."); boolean doItAgain; do { doItAgain = false; System.out.println("Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division"); String operation; //Scanner keyboard = new Scanner(System.in); operation = keyboard.next(); //System.out.println("DB: operation = " + operation); if(operation.equals("+") ) standardCalcHelper('+'); else if(operation.equals("-")) standardCalcHelper('-'); else if(operation.equals("*")) standardCalcHelper('*'); else if(operation.equals("/")) standardCalcHelper('/'); else { System.out.println("Invalid operator " + operation); doItAgain = true; } } while(doItAgain); } public static void scientific() { System.out.println("The calculator will operate in scientific mode."); boolean doItAgain; do { doItAgain = false; System.out.println("Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division, 'sin' for sin x, 'cos' for cos x, 'tan' for tan x:"); String operation; // Scanner keyboard = new Scanner(System.in); operation = keyboard.next(); if(operation.equals("+")) standardCalcHelper('+'); else if(operation.equals("-")) standardCalcHelper('-'); else if(operation.equals("*")) standardCalcHelper('*'); else if(operation.equals("/")) standardCalcHelper('/'); else if(operation.equals("sin")) scientificCalcHelper('s'); else if(operation.equals("cos")) scientificCalcHelper('c'); else if(operation.equals("tan"))scientificCalcHelper('t'); else { System.out.println("Invalid operator " + operation); doItAgain = true; } } while(doItAgain); } static String getOperationName(char operation) { if(operation == '+') return "add"; else if(operation == '-') return "subtract"; else if(operation == '*') return "multiply"; else if(operation == '/') return "divide"; else if(operation == 's') return "sine"; else if(operation == 'c') return "cosine"; else if(operation == 't') return "tangent"; return ""; } static void standardCalcHelper(char operation) { //Scanner sc = new Scanner(System.in); System.out.println("How many numbers do you want to " + getOperationName(operation) + "?"); int times = keyboard.nextInt(); // if(times > 0) System.out.println("Enter " + times + " numbers"); double result = keyboard.nextDouble(); for (int i = 0; i < times-1; i++){ if(operation == '+') result += keyboard.nextDouble(); else if(operation == '-') result -= keyboard.nextDouble(); else if(operation == '*') result *= keyboard.nextDouble(); else if(operation == '/') result /= keyboard.nextDouble(); } System.out.println("Result: " + result); } static void scientificCalcHelper(char operation) { System.out.println("Enter a number in radians to find the " + getOperationName(operation)); double number; Scanner scanner =new Scanner(System.in); number = scanner.nextInt(); // double radian = keyboard.nextDouble(); // double result = Math.sin(radian); // System.out.println( "Result: " + result); if(operation == 's')     System.out.println("Result: " + Math.sin(number)); else if(operation=='c')     System.out.println("Result: " + Math.cos(number)); else if(operation == 't')     System.out.println("Result: " + Math.tan(number)); } }

How do I fix the result? import java.lang.*; import java.util.Scanner; // import the Scanner class public class Main { public static Scanner keyboard = new Scanner(System.in); public static void main(String[] args) { boolean doItAgain = false; do { doItAgain = false; calcType(); System.out.println("Do you want to start over? (Y/N)"); //Scanner keyboard = new Scanner(System.in); String decision = keyboard.next(); if(decision.equals("Y")) { doItAgain = true; } } while(doItAgain); System.out.println("Goodbye"); } public static void calcType() { String mode; System.out.println("Enter the calculator mode: Standard/Scientific?"); //Scanner keyboard = new Scanner(System.in); mode = keyboard.next(); if(mode.equals("Standard")) { standard(); } else if (mode.equals("Scientific")) { scientific(); } else System.out.println("Unknown calculator type: " + mode); } public static void standard() { System.out.println("The calculator will operate in standard mode."); boolean doItAgain; do { doItAgain = false; System.out.println("Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division"); String operation; //Scanner keyboard = new Scanner(System.in); operation = keyboard.next(); //System.out.println("DB: operation = " + operation); if(operation.equals("+") ) standardCalcHelper('+'); else if(operation.equals("-")) standardCalcHelper('-'); else if(operation.equals("*")) standardCalcHelper('*'); else if(operation.equals("/")) standardCalcHelper('/'); else { System.out.println("Invalid operator " + operation); doItAgain = true; } } while(doItAgain); } public static void scientific() { System.out.println("The calculator will operate in scientific mode."); boolean doItAgain; do { doItAgain = false; System.out.println("Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division, 'sin' for sin x, 'cos' for cos x, 'tan' for tan x:"); String operation; // Scanner keyboard = new Scanner(System.in); operation = keyboard.next(); if(operation.equals("+")) standardCalcHelper('+'); else if(operation.equals("-")) standardCalcHelper('-'); else if(operation.equals("*")) standardCalcHelper('*'); else if(operation.equals("/")) standardCalcHelper('/'); else if(operation.equals("sin")) scientificCalcHelper('s'); else if(operation.equals("cos")) scientificCalcHelper('c'); else if(operation.equals("tan"))scientificCalcHelper('t'); else { System.out.println("Invalid operator " + operation); doItAgain = true; } } while(doItAgain); } static String getOperationName(char operation) { if(operation == '+') return "add"; else if(operation == '-') return "subtract"; else if(operation == '*') return "multiply"; else if(operation == '/') return "divide"; else if(operation == 's') return "sine"; else if(operation == 'c') return "cosine"; else if(operation == 't') return "tangent"; return ""; } static void standardCalcHelper(char operation) { //Scanner sc = new Scanner(System.in); System.out.println("How many numbers do you want to " + getOperationName(operation) + "?"); int times = keyboard.nextInt(); // if(times > 0) System.out.println("Enter " + times + " numbers"); double result = keyboard.nextDouble(); for (int i = 0; i < times-1; i++){ if(operation == '+') result += keyboard.nextDouble(); else if(operation == '-') result -= keyboard.nextDouble(); else if(operation == '*') result *= keyboard.nextDouble(); else if(operation == '/') result /= keyboard.nextDouble(); } System.out.println("Result: " + result); } static void scientificCalcHelper(char operation) { System.out.println("Enter a number in radians to find the " + getOperationName(operation)); double number; Scanner scanner =new Scanner(System.in); number = scanner.nextInt(); // double radian = keyboard.nextDouble(); // double result = Math.sin(radian); // System.out.println( "Result: " + result); if(operation == 's')     System.out.println("Result: " + Math.sin(number)); else if(operation=='c')     System.out.println("Result: " + Math.cos(number)); else if(operation == 't')     System.out.println("Result: " + Math.tan(number)); } }

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Question

How do I fix the result?

import java.lang.*;
import java.util.Scanner; // import the Scanner class

public class Main {

public static Scanner keyboard = new Scanner(System.in);

public static void main(String[] args) {

boolean doItAgain = false;
do
{
doItAgain = false;
calcType();
System.out.println("Do you want to start over? (Y/N)");
//Scanner keyboard = new Scanner(System.in);
String decision = keyboard.next();
if(decision.equals("Y")) {
doItAgain = true;
}
}
while(doItAgain);
System.out.println("Goodbye");
}

public static void calcType() {
String mode;
System.out.println("Enter the calculator mode: Standard/Scientific?");
//Scanner keyboard = new Scanner(System.in);
mode = keyboard.next();
if(mode.equals("Standard")) {
standard();
}
else if (mode.equals("Scientific")) {
scientific();
}
else
System.out.println("Unknown calculator type: " + mode);
}

public static void standard() {
System.out.println("The calculator will operate in standard mode.");
boolean doItAgain;
do
{
doItAgain = false;
System.out.println("Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division");

String operation;
//Scanner keyboard = new Scanner(System.in);
operation = keyboard.next();
//System.out.println("DB: operation = " + operation);

if(operation.equals("+") ) standardCalcHelper('+');
else if(operation.equals("-")) standardCalcHelper('-');
else if(operation.equals("*")) standardCalcHelper('*');
else if(operation.equals("/")) standardCalcHelper('/');
else {
System.out.println("Invalid operator " + operation);
doItAgain = true;
}
}
while(doItAgain);
}

public static void scientific() {
System.out.println("The calculator will operate in scientific mode.");
boolean doItAgain;
do
{
doItAgain = false;
System.out.println("Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division, 'sin' for sin x, 'cos' for cos x, 'tan' for tan x:");
String operation;
// Scanner keyboard = new Scanner(System.in);
operation = keyboard.next();

if(operation.equals("+")) standardCalcHelper('+');
else if(operation.equals("-")) standardCalcHelper('-');
else if(operation.equals("*")) standardCalcHelper('*');
else if(operation.equals("/")) standardCalcHelper('/');
else if(operation.equals("sin")) scientificCalcHelper('s');
else if(operation.equals("cos")) scientificCalcHelper('c');
else if(operation.equals("tan"))scientificCalcHelper('t');
else {
System.out.println("Invalid operator " + operation);
doItAgain = true;
}
}
while(doItAgain);
}

static String getOperationName(char operation) {
if(operation == '+') return "add";
else if(operation == '-') return "subtract";
else if(operation == '*') return "multiply";
else if(operation == '/') return "divide";
else if(operation == 's') return "sine";
else if(operation == 'c') return "cosine";
else if(operation == 't') return "tangent";

return "";
}

static void standardCalcHelper(char operation) {

//Scanner sc = new Scanner(System.in);
System.out.println("How many numbers do you want to " + getOperationName(operation) + "?");
int times = keyboard.nextInt();
// if(times > 0)
System.out.println("Enter " + times + " numbers");
double result = keyboard.nextDouble();
for (int i = 0; i < times-1; i++){
if(operation == '+') result += keyboard.nextDouble();
else if(operation == '-') result -= keyboard.nextDouble();
else if(operation == '*') result *= keyboard.nextDouble();
else if(operation == '/') result /= keyboard.nextDouble();
}
System.out.println("Result: " + result);
}

static void scientificCalcHelper(char operation) {
System.out.println("Enter a number in radians to find the " + getOperationName(operation));
double number;
Scanner scanner =new Scanner(System.in);
number = scanner.nextInt();
// double radian = keyboard.nextDouble();
// double result = Math.sin(radian);
// System.out.println( "Result: " + result);
if(operation == 's')
    System.out.println("Result: " + Math.sin(number));
else if(operation=='c')
    System.out.println("Result: " + Math.cos(number));
else if(operation == 't')
    System.out.println("Result: " + Math.tan(number));
}

}

**Calculator Operation Example** **Input:** ``` Standard + 2 99 47 Y Scientific cos 2 Y Scientific sin 3 N ``` **Your Output:** ``` Enter the calculator mode: Standard/Scientific? The calculator will operate in standard mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. How many numbers do you want to add? Enter 2 numbers Result: 146.0 Do you want to start over? (Y/N) Enter the calculator mode: Standard/Scientific? The calculator will operate in scientific mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. Enter a number in radians to find the cosine ``` **Expected Output:** ``` Enter the calculator mode: Standard/Scientific? The calculator will operate in standard mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. How many numbers do you want to add? Enter 2 numbers Result: 146.0 Do you want to start over? (Y/N) Enter the calculator mode: Standard/Scientific? The calculator will operate in scientific mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. Enter a number in radians to find the cosine Result: -0.4161468365471424 Do you want to start over? (Y/N) Enter the calculator mode: Standard/Scientific? The calculator will operate in scientific mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. Enter a number in radians to find the sine Result: 0.1411200080598672 Do you want to start over? (Y/N) Goodbye ``` **Explanation:** - The calculator first operates in Standard mode performing a basic addition of 99 and 47, resulting in 146.0. - The user chooses to restart in Scientific mode. - The calculator computes the cosine of 2 radians, yielding a result of approximately -0.416. - The user opts to restart again in Scientific mode. - The sine of 3 radians is calculated, resulting in approximately 0.141. - The user finally chooses not to restart, ending the session with "Goodbye". This example demonstrates switching between Standard and Scientific modes in iterative calculations, with user inputs dictating operations and modes.
Transcribed Image Text:**Calculator Operation Example** **Input:** ``` Standard + 2 99 47 Y Scientific cos 2 Y Scientific sin 3 N ``` **Your Output:** ``` Enter the calculator mode: Standard/Scientific? The calculator will operate in standard mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. How many numbers do you want to add? Enter 2 numbers Result: 146.0 Do you want to start over? (Y/N) Enter the calculator mode: Standard/Scientific? The calculator will operate in scientific mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. Enter a number in radians to find the cosine ``` **Expected Output:** ``` Enter the calculator mode: Standard/Scientific? The calculator will operate in standard mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. How many numbers do you want to add? Enter 2 numbers Result: 146.0 Do you want to start over? (Y/N) Enter the calculator mode: Standard/Scientific? The calculator will operate in scientific mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. Enter a number in radians to find the cosine Result: -0.4161468365471424 Do you want to start over? (Y/N) Enter the calculator mode: Standard/Scientific? The calculator will operate in scientific mode. Enter '+' for addition, '-' for subtractions, '*' for multiplication, '/' for division. Enter a number in radians to find the sine Result: 0.1411200080598672 Do you want to start over? (Y/N) Goodbye ``` **Explanation:** - The calculator first operates in Standard mode performing a basic addition of 99 and 47, resulting in 146.0. - The user chooses to restart in Scientific mode. - The calculator computes the cosine of 2 radians, yielding a result of approximately -0.416. - The user opts to restart again in Scientific mode. - The sine of 3 radians is calculated, resulting in approximately 0.141. - The user finally chooses not to restart, ending the session with "Goodbye". This example demonstrates switching between Standard and Scientific modes in iterative calculations, with user inputs dictating operations and modes.
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