Java Assignment If the user attempts to divide by 0, my divide method is suppose

Question

Java Assignment

If the user attempts to divide by 0, my divide method is supposed to prevent the division by 0 which is undefined and then assign Double.NaN to the relevan array element.

I also need to have comma's in between each of the responses for each part of the array answer.

Here is my code.

import java.util.*;

public class Calculator {

public static void main(String[] args) {

Scanner choose = new Scanner(System.in);

int choice = 0;

int size;

double num1[], num2[];

do {

choice = getMenuOption(choose);

if ((choice <= 7) && (choice > 0)) {

switch (choice)

{

case 1:

size = getOperand("How many values are in the arrays? ", choose);

num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);

num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);

add(num1, num2);

break;

case 2:

size = getOperand("How many values are in the arrays? ", choose);

num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);

num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);

subtract(num1, num2);

break;

case 3:

size = getOperand("How many values are in the arrays? ", choose);

num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);

num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);

multiply(num1, num2);

break;

case 4:

size = getOperand("How many values are in the arrays? ", choose);

num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);

num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);

divide(num1, num2);

break;

case 5:

size = getOperand("How many values are in the arrays? ", choose);

num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);

num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);

dotProduct(num1, num2);

break;

case 6:

size = getOperand("How many values should be in the random array? ", choose);

int lowerLimit = getOperand("What is the lower limit for the random number? ", choose);

int upperLimit = getOperand("What is the upper limit for the random number? ", choose);

random(lowerLimit, upperLimit, size);

break;

case 7:

System.out.println("Good Bye");

break;

}

} else {

System.out.println("I'm Sorry," + choice + " is invalid");

}

} while (choice != 7);

choose.close();

}

public static int getMenuOption(Scanner choose) {

int choice;

System.out.println(" ");

System.out.println("Menu");

System.out.println("1. Add");

System.out.println("2. Subtract ");

System.out.println("3. Multiply ");

System.out.println("4. Divide ");

System.out.println("5. Dot Product ");

System.out.println("6. Generate Random array ");

System.out.println("7. Quit ");

System.out.println(" ");

System.out.println("What would you like to do? ");

choice = choose.nextInt();

return choice;

}

public static double[] getOperand(String prompt, int size, Scanner choose) {

System.out.print(prompt);

double option[] = new double[size];

for (int i = 0; i < size; i++) {

option[i] = choose.nextDouble();

}

return option;

}

public static int getOperand(String prompt, Scanner choose) {

System.out.print(prompt);

int option = choose.nextInt();

return option;

}

public static double[] add(double[] num1, double[] num2) {

double[] answer = new double[num1.length];

System.out.print("The result is [ ");

if (num1.length == num2.length) {

for (int i = 0; i < num1.length; i++) {

answer[i] = num1[i] + num2[i];

System.out.print(answer[i] + " ");

}

} else {

System.out.println("Invalid length of arrays - Addition operation cannot be performed");

}

System.out.print("] ");

return answer;

}

public static double[] subtract(double[] num1, double[] num2) {

double[] answer = new double[num1.length];

System.out.print("The result is [ ");

if (num1.length == num2.length) {

for (int i = 0; i < num1.length; i++) {

answer[i] = num1[i] - num2[i];

System.out.print(answer[i] + " ");

}

} else {

System.out.println("Invalid length of arrays - Subtraction operation cannot be performed");

}

System.out.print("] ");

return answer;

}

public static double[] multiply(double[] num1, double[] num2) {

double[] answer = new double[num1.length];

System.out.print("The result is [ ");

if (num1.length == num2.length) {

for (int i = 0; i < num1.length; i++) {

answer[i] = num1[i] * num2[i];

System.out.print(answer[i] + " ");

}

} else {

System.out.println("Invalid length of arrays - Multiplication operation cannot be performed");

}

System.out.print("] ");

return answer;

}

public static double[] divide(double[] num1, double[] num2) {

Scanner choose = new Scanner(System.in);

double[] answer = new double[num1.length];

System.out.print("The result is [ ");

if (num1.length == num2.length) {

for (int i = 0; i < num1.length; i++) {

answer[i] = num1[i] / num2[i];

if (num2[i] != 0)

{

System.out.print(answer[i] + " ");

}

if (num2[i] == 0)

{

System.out.print("NaN ");

}

}

} else {

System.out.println("Invalid length of arrays - Division operation cannot be performed");

}

System.out.print(" ] ");

return answer;

}

public static double dotProduct(double[] num1, double[] num2) {

double[] answer = new double[num1.length];

System.out.print("The result is ");

double sum = 0;

if (num1.length == num2.length) {

for (int i = 0; i < num1.length; i++) {

answer[i] = num1[i] * num2[i];

sum = sum + answer[i];

}

} else {

System.out.println("Invalid length of arrays - Dot product operation cannot be performed");

}

System.out.print(sum);

return sum;

}

public static double[] random(int lowerLimit, int upperLimit, int size) {

Random rand = new Random();

double[] randNum = new double[size];

System.out.print("The result is [ ");

for (int i = 0; i < size; i++) {

randNum[i] = lowerLimit + (upperLimit - lowerLimit) * rand.nextDouble();

System.out.print(randNum[i] + " ");

}

System.out.print(" ] ");

return randNum;

}

}

Explanation / Answer

Given below is the modified code for the question.
To indent code in eclipse , select code by pressing ctrl+a and then indent using ctrl+i
Please do rate the answer if it was helpful. Thank you

import java.util.*;
public class Calculator2 {
public static void main(String[] args) {
Scanner choose = new Scanner(System.in);
int choice = 0;
int size;
double num1[], num2[];
do {
choice = getMenuOption(choose);
if ((choice <= 7) && (choice > 0)) {
switch (choice)
{
case 1:
size = getOperand("How many values are in the arrays? ", choose);
num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);
num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);
add(num1, num2);
break;
case 2:
size = getOperand("How many values are in the arrays? ", choose);
num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);
num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);
subtract(num1, num2);
break;
case 3:
size = getOperand("How many values are in the arrays? ", choose);
num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);
num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);
multiply(num1, num2);
break;
case 4:
size = getOperand("How many values are in the arrays? ", choose);
num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);
num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);
divide(num1, num2);
break;
case 5:
size = getOperand("How many values are in the arrays? ", choose);
num1 = getOperand("Enter the values in the first array, separated by spaces: ", size, choose);
num2 = getOperand("Enter the values in the second array, separated by spaces: ", size, choose);
dotProduct(num1, num2);
break;
case 6:
size = getOperand("How many values should be in the random array? ", choose);
int lowerLimit = getOperand("What is the lower limit for the random number? ", choose);
int upperLimit = getOperand("What is the upper limit for the random number? ", choose);
random(lowerLimit, upperLimit, size);
break;
case 7:
System.out.println("Good Bye");
break;
}
} else {
System.out.println("I'm Sorry," + choice + " is invalid");
}
} while (choice != 7);
choose.close();
}
public static int getMenuOption(Scanner choose) {
int choice;
System.out.println(" ");
System.out.println("Menu");
System.out.println("1. Add");
System.out.println("2. Subtract ");
System.out.println("3. Multiply ");
System.out.println("4. Divide ");
System.out.println("5. Dot Product ");
System.out.println("6. Generate Random array ");
System.out.println("7. Quit ");
System.out.println(" ");
System.out.println("What would you like to do? ");
choice = choose.nextInt();
return choice;
}
public static double[] getOperand(String prompt, int size, Scanner choose) {
System.out.print(prompt);
double option[] = new double[size];
for (int i = 0; i < size; i++) {
option[i] = choose.nextDouble();
}
return option;
}
public static int getOperand(String prompt, Scanner choose) {
System.out.print(prompt);
int option = choose.nextInt();
return option;
}
public static double[] add(double[] num1, double[] num2) {
double[] answer = new double[num1.length];
System.out.print("The result is [ ");
if (num1.length == num2.length) {
for (int i = 0; i < num1.length; i++) {
answer[i] = num1[i] + num2[i];
if(i != 0)
System.out.print(", ");
System.out.print(answer[i] );
}
} else {
System.out.println("Invalid length of arrays - Addition operation cannot be performed");
}
System.out.print("] ");
return answer;
}
public static double[] subtract(double[] num1, double[] num2) {
double[] answer = new double[num1.length];
System.out.print("The result is [ ");
if (num1.length == num2.length) {
for (int i = 0; i < num1.length; i++) {
answer[i] = num1[i] - num2[i];
if(i != 0)
System.out.print(", ");
System.out.print(answer[i] );
}
} else {
System.out.println("Invalid length of arrays - Subtraction operation cannot be performed");
}
System.out.print("] ");
return answer;
}
public static double[] multiply(double[] num1, double[] num2) {
double[] answer = new double[num1.length];
System.out.print("The result is [ ");
if (num1.length == num2.length) {
for (int i = 0; i < num1.length; i++) {
answer[i] = num1[i] * num2[i];
if(i != 0)
System.out.print(", ");
System.out.print(answer[i] );
}
} else {
System.out.println("Invalid length of arrays - Multiplication operation cannot be performed");
}
System.out.print("] ");
return answer;
}
public static double[] divide(double[] num1, double[] num2) {
Scanner choose = new Scanner(System.in);
double[] answer = new double[num1.length];
System.out.print("The result is [ ");
if (num1.length == num2.length) {
for (int i = 0; i < num1.length; i++) {
if(num2[i] == 0)
answer[i] = Double.NaN;
else
answer[i] = num1[i] / num2[i];
if(i != 0)
System.out.print(", ");
System.out.print(answer[i] );
}
} else {
System.out.println("Invalid length of arrays - Division operation cannot be performed");
}
System.out.print(" ] ");
return answer;
}
public static double dotProduct(double[] num1, double[] num2) {
double[] answer = new double[num1.length];
System.out.print("The result is ");
double sum = 0;
if (num1.length == num2.length) {
for (int i = 0; i < num1.length; i++) {
answer[i] = num1[i] * num2[i];
sum = sum + answer[i];
}
} else {
System.out.println("Invalid length of arrays - Dot product operation cannot be performed");
}
System.out.print(sum);
return sum;
}
public static double[] random(int lowerLimit, int upperLimit, int size) {
Random rand = new Random();
double[] randNum = new double[size];
System.out.print("The result is [ ");
for (int i = 0; i < size; i++) {
randNum[i] = lowerLimit + (upperLimit - lowerLimit) * rand.nextDouble();
System.out.print(randNum[i] + " ");
}
System.out.print(" ] ");
return randNum;
}
}


output
=====
Menu
1. Add
2. Subtract
3. Multiply
4. Divide
5. Dot Product
6. Generate Random array
7. Quit
What would you like to do?
1
How many values are in the arrays?
2
Enter the values in the first array, separated by spaces:
3 4
Enter the values in the second array, separated by spaces:
5 6
The result is [ 8.0, 10.0]  
Menu
1. Add
2. Subtract
3. Multiply
4. Divide
5. Dot Product
6. Generate Random array
7. Quit
What would you like to do?
4
How many values are in the arrays?
2
Enter the values in the first array, separated by spaces:
10 20
Enter the values in the second array, separated by spaces:
2 5
The result is [ 5.0, 4.0 ]  
Menu
1. Add
2. Subtract
3. Multiply
4. Divide
5. Dot Product
6. Generate Random array
7. Quit
What would you like to do?
4
How many values are in the arrays?
2
Enter the values in the first array, separated by spaces:
10 20
Enter the values in the second array, separated by spaces:
5 0
The result is [ 2.0, NaN ]  
Menu
1. Add
2. Subtract
3. Multiply
4. Divide
5. Dot Product
6. Generate Random array
7. Quit
What would you like to do?
7
Good Bye

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