Question

Problem specifications:

You are tasked with developing a complete temperature conversion program in Java.

Your program should:

-prompt the user with the following menu:

-1-Convert Fahrenheit to Celcius

-2-Convert Celcius to Fahrenheit

-3-Quit Program

The menu must be coded in its own method.

-If user select option 1 then call a method that prompts the user to enter a value in degrees Fahrenheit and return it back to main.

-call a method that converts from Fahrenheit to Celcius

-call a method that displays the degrees in Fahrenheit and its equivalent in degress celcius.

-If user select option 2 then call a method that prompts the user to enter a value in degrees Celcius and return it back to main.

-call a method that converts from Celcius to Fahrenheit.

-call a method that displays the degrees in Celcius and its equivalent in degress celcius.

-if user select option three, abort the process and display a suitable message to that effect.

-the program must repeat the whole processes until user select 3.

-do not allow user to select a value other than 1, 2, or3 from the menu

-declare all needed variables inside the class (globally inside) and out of all methods including main().

Answer 1

import java.util.Scanner;

public class TemperatureConverterMenu {

   // returns the temperature in Celcius
   public static double toCelcius() {
       Scanner sc = new Scanner(System.in);
       System.out.println("Enter temperature in Fahrenheit: ");
       double fTemp=sc.nextDouble();
return (( 5 *(fTemp- 32.0)) / 9.0);

   }
   public static double toFahrenheit() {
       Scanner sc = new Scanner(System.in);
       System.out.println("Enter temperature in Celcius : ");
       double fTemp=sc.nextDouble();
       return (9.0/5.0)*fTemp + 32;
   }

   public static void main(String[] args) {
       int ch=0;
       Scanner sc = new Scanner(System.in);
       do{
           System.out.println("-1-Convert Fahrenheit to Celcius");
           System.out.println("-2-Convert Celcius to Fahrenheit");
           System.out.println("-3-Quit Program");
           ch=sc.nextInt();
           switch(ch){
           case 1:System.out.println(toCelcius());break;
           case 2:System.out.println(toFahrenheit());break;
           }
       }while(ch<3);
   }

}