import java.util.Scanner;

/* Java application that produces a Fahrenheit-to-Celsius conversion table.
** The user provides as input (via the keyboard) the floor and ceiling
** Fahrenheit temperatures and the "delta" (the amount by which each line's
** Fahrenheit temperature exceeds that of the previous line).
** (The previous version converted a single Fahrenheit temperature rather
** than producing a table of conversions.)
**
** Author: R. McCloskey
** Date: Mar. 2015
*/

public class FahToCel3 {

   public static void main(String[] args) {

      // Create a new Scanner object that can read input from the keyboard.
      Scanner keyboard = new Scanner(System.in);

      double fahFloor;    // first Fah. temp. in the table
      double fahDelta;    // increase in Fah. temp. from one row to next
      double fahCeil;     // upper bound on Fah. temp.'s in the table

      // Prompt user for each input value, and read them.
      System.out.print("Enter Fahrenheit floor temperature: ");
      fahFloor = keyboard.nextDouble();

      System.out.print("Enter Fahrenheit delta: ");
      fahDelta = keyboard.nextDouble();

      System.out.print("Enter Fahrenheit ceiling: ");
      fahCeil = keyboard.nextDouble();

      // Print table's column headings.
      System.out.println("Fahrenheit    Celsius");
      System.out.println("----------   ---------");

      // Produce the body of the table.  Each loop iteration produces
      // a single row.
      for (double fah = fahStart; fah <= fahCeil; fah = fah + fahDelta)
      {
         double celTemp = fahToCel(fah);
         System.out.println(fah + "F       " + celTemp + "C");
      }
   }


   /* Returns the Celsius equivalent of the given Fahrenheit temperature (f).
   */
   private static double fahToCel(double f) {
      return (5.0 / 9.0) * (f - 32);
   }

}