public class LengthConverter {

   /* This program will convert measurements expressed in inches,
      feet, yards, or miles into each of the possible units of
      measure.  The measurement is input by the user, followed by
      the unit of measure.  For example:  "17 feet", "1 inch",
      "2.73 mi".  Abbreviations in, ft, yd, and mi are accepted.
      The program will continue to read and convert measurements
      until the user enters an input of 0.
   */

   public static void main(String[] args) {
      
      double measurement;  // Numerical measurement, input by user.
      String units;        // The unit of measure for the input, also
                           //    specified by the user.
      
      double inches, feet, yards, miles;  // Measurement expressed in each
                                          //   possible unit of measure.
      
      TextIO.putln("Enter measurements in inches, feet, yards, or miles.");
      TextIO.putln("For example:  1 inch    17 feet    2.73 miles");
      TextIO.putln("You can use abbreviations:   in   ft  yd   mi");
      TextIO.putln("I will convert your input into the other units of measure.");
      TextIO.putln();
      
      while (true) {
         
         /* Get the user's input, and converts units to lower case. */
         
         TextIO.put("Enter your measurement, or 0 to end:  ");
         measurement = TextIO.getDouble();
         if (measurement == 0)
            break;  // terminate the while loop
         units = TextIO.getlnWord();            
         units = units.toLowerCase();
         
         /* Convert the input measurement to inches. */
         
         if (units.equals("inch") || units.equals("inches") || units.equals("in"))
             inches = measurement;
         else if (units.equals("foot") || units.equals("feet") || units.equals("ft"))
             inches = measurement * 12;
         else if (units.equals("yard") || units.equals("yards") || units.equals("yd"))
             inches = measurement * 36;
         else if (units.equals("mile") || units.equals("miles") || units.equals("mi"))
             inches = measurement * 12 * 5280;
         else {
             TextIO.putln("Sorry, but I don't understand \"" + units + "\".");
             continue;  // back to start of while loop
         }
         
         /* Convert the measurement in inches to feet, yards, and miles. */
         
         feet = inches / 12;
         yards = inches / 36;
         miles = inches / (12*5280);
         
         /* Output the measurement in terms of each unit of measure. */
         
         TextIO.putln();
         TextIO.putln("That's equivalent to:");
         TextIO.put(inches, 15);
         TextIO.putln(" inches");
         TextIO.put(feet, 15);
         TextIO.putln(" feet");
         TextIO.put(yards, 15);
         TextIO.putln(" yards");
         TextIO.put(miles, 15);
         TextIO.putln(" miles");
         TextIO.putln();
      
      } // end while
      
      TextIO.putln();
      TextIO.putln("OK!  Bye for now.");
      
   } // end main()
   
} // end class LengthConverter