Java The problem is the random also needs to be a double as well.

import java.util.*;

public class Calculator {

public static void main(String[] args){

Scanner choose = new Scanner(System.in);

Random input = new Random();

int choice=0;

int size;

String prompt;

boolean right = false;

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? ");

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

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

add(num1,num2);

break;

case 2:

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

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

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

subtract(num1,num2);

break;

case 3:

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

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

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

multiply(num1,num2);

break;

case 4:

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

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

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

divide(num1,num2);

break;

case 5:

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

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

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

dotProduct(num1,num2);

break;

case 6:

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

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

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

random(lowerLimit,upperLimit,size);

break;

case 7:

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

break;

}

}else{

right=true;

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

}

}while(choice!=7);

}

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=new Scanner(System.in);

System.out.print(prompt);

double option[]=new double[size];

for(int i=0;i

option[i]=choose.nextDouble();

}

return option;

}

public static int getOperand(String prompt){

Scanner choose=new Scanner(System.in);

System.out.print(prompt);

int option=choose.nextInt();

return option;

}

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

Scanner choose=new Scanner(System.in);

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

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

for(int i=0;i

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

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

}

System.out.print("] ");

return answer;

}

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

Scanner choose=new Scanner(System.in);

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

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

for(int i=0;i

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

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

}

System.out.print("] ");

return answer;

}

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

Scanner choose=new Scanner(System.in);

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

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

for(int i=0;i

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

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

}

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 [ ");

for(int i=0;i

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

if(num2[i]!=0)

{

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

}

if(num2[i]==0)

{

System.out.print("Nan ");

}

}

System.out.print(" ] ");

return answer;

}

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

Scanner choose=new Scanner(System.in);

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

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

double sum=0;

for(int i=0;i

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

sum=sum+answer[i];

}

System.out.print(sum);

return sum;

}

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

Scanner choose=new Scanner(System.in);

Random rand=new Random();

int[] randNum=new int[size];

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

for(int i=0;i

randNum[i]=rand.nextInt(upperLimit)+lowerLimit;

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

}

System.out.print(" ] ");

return randNum;

}

}