i am trying to figure out what i should put my parameters to when i call up a second 5189370

I am trying to figure out what I should put my parameters to when I call up a second method in the following code. Also if I didnt want a return value I us void but how do I call up a method that doesnt actually need specific parameters? like can I say if you select option 1 such and such method gets called up where 1 the parameter used to call the method up has no real purpose in that method other than calling it up. Thanks in advance here the code

import java.util.Scanner;
public class CelsuistoFahrenheit {

   public static void main(String[] args) {
       //Fahrenheit to Celsuis or celsuis to Fahrenheit converter
       Scanner input = new Scanner(System.in);
       //Determining Temperature base scale
       System.out.println(” PLease enter the temperature to convert ” +
               ” by first entering Fahrenheit or Celsuis”);
       String tempScale = input.nextLine();
       //Calculating respective conversion based on input
       //for fahreheit to celsius
       switch (tempScale) {
           case “Fahrenheit” :System.out.println(” Great now enter the temperature “);
                           System.out.println(” “);//space formatting
                           double fahrenheit = input.nextDouble();             
                           //double celsius = Math.round((5.0/9.0)*(fahrenheit – 32));
                           System.out.println(” “);
                           System.out.println(fahrenheit + ” degrees fahrenheit is ” +
                                   celsius + ” degrees celsius “);
       // For celsius to fahrenheit
           case “Celsuis” :System.out.println(” Thanks now enter the temperature to convert”);
                           System.out.println(” “);
                           double celsius1 = input.nextDouble();
                           double fahrenheit1 = Math.round((9.0/5.0)*(celsius1) + (32.0));
                           System.out.println(” “);
                           System.out.println(celsius1 + ” degrees celsius is ” + fahrenheit1 +
                                   ” degrees fahrenheit “);
       //closing statements
       System.out.println(” “);
       System.out.println(” Hope this was helpful, bye”);

   public static double FScale(double fahrenheit){
       //Scanner input = new Scanner(System.in);
       //fahrenheit = input.nextDouble();             
       double celsius = Math.round((5.0/9.0)*(fahrenheit – 32));
       return celsius;


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