Java question The problem is in the public stat void divide portion of my code. If the user enters a 0 as the second number, the result should be The current value is NaN. I am getting that but I am also getting The current value is 48.

Also, if an incorrect choice is made it should tell the user that. It's in my code but not working.

import java.util.Scanner;

public class Memory {

//Static variable to hold result

private static double currentValue=0;

//Main function

public static void main(String[] args)

{

Scanner choose = new Scanner(System.in);

int choice = 0;

String prompt;

boolean right = false;

double num2;

//Iterate till user wants to quit

do

{

//Displaying current value

System.out.println("The current value is " + currentValue);

//Displaying menu

choice = displayMenu(choose);

//Checking for valid option

if ((choice <= 6) && (choice > 0))

{

//Calling appropriate function

switch(choice)

{

case 1: num2 = getOperand("What is the second number? "); add(num2); break;

case 2: num2 = getOperand("What is the second number? "); subtract(num2); break;

case 3: num2 = getOperand("What is the second number? "); multiply(num2); break;

case 4: num2 = getOperand("What is the second number? "); divide(num2); break;

case 5: case 6: currentValue = 0; System.out.println("Goodbye!"); break;

}

}

else

{

right = true;

System.out.println("I'm sorry, " + choice + " wasn't one of the options.");

}

}while (choice != 6);

}

//Displaying menu

public static int displayMenu(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. Clear");

System.out.println("6. Quit");

System.out.println(" ");

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

choice = choose.nextInt();

return choice;

}

public static double getOperand(String prompt)

{

Scanner choose = new Scanner(System.in);

System.out.print(prompt);

double option = choose.nextDouble();

return option;

}

public double getCurrentValue(double currentValue)

{

return currentValue;

}

public static void add(double num2)

{

currentValue += num2;

}

public static void subtract(double num2)

{

currentValue -= num2;

}

public static void multiply(double num2)

{

currentValue *= num2;

}

public static void divide(double num2)

{

if (num2 == 0)

{

System.out.println(" The current value is Nan. ");

}

else

{

currentValue /= num2;

}

}

public void clear()

{

currentValue = 0;

}

}