Write a program with reads a Celsius degree value from the console or a Fahrenheit degree value from the console , then converts it to Fahrenheit or Celsius and displays the result. The formulas for the conversion are as follows:

Fahrenheit = (9 / 5) * Celsius + 32

Celsius = (5/9) *(Fahrenheit -32)

I can write this program with ease using a If/Else statement, but we have to use a Switch/Case statement as well as a If/Else statement.

I know that I'll need a double for the conversion because it will have 9.0 or 5.0 to get the correct answer, but as you know, you cant use a double with a switch/case.

I've seen this part being used at the beginning but i'll need help understanding what it is because we have only learned public static void so far.

//public static double FahrenheitToCelsius(double fahrenheit)

I'd rather not use this way because i have not learned it yet.

Also please keep it simple, i'm only in chapter 3 of this intro to java programming 1.