public class TempConverter {
    public enum TEMP_TYPE {
        Celsius, Fahrenheit;
    }

    private final static TEMP_TYPE DEFAULT_TEMP_TYPE = TEMP_TYPE.Celsius;
    private final TEMP_TYPE convertingFrom, convertingTo;

    public TempConverter(TEMP_TYPE convertFrom) {
        convertingFrom = convertFrom;

        if (convertFrom == TEMP_TYPE.Celsius) {
            convertingTo = TEMP_TYPE.Fahrenheit;
        }
        else if (convertFrom == TEMP_TYPE.Fahrenheit) {
            convertingTo = TEMP_TYPE.Celsius;
        }
        else {
            convertingTo = DEFAULT_TEMP_TYPE;
        }
    }



    public int convertTemp(double fromTemp) {
        int toTemp = 0;

        if (convertingFrom == TEMP_TYPE.Fahrenheit) {
            toTemp = (int)(Math.round((fromTemp - 32) * (5.0 / 9.0)));
        }
        else if (convertingFrom == TEMP_TYPE.Celsius) {
            toTemp = (int)(Math.round(fromTemp * 1.8 + 32));
        }
        else {
            throw new TempTypeDoesntExistException("Temperature type isn't supported.");
        }

        return toTemp;
    }



    public TEMP_TYPE fromTempType() {
        return convertingFrom;
    }

    public TEMP_TYPE toTempType() {
        return convertingTo;
    }

    public String fromTempTypeStr() {
        return convertingFrom.toString();
    }

    public String toTempTypeStr() {
        return convertingTo.toString();
    }




    public static class TempTypeDoesntExistException extends IndexOutOfBoundsException {
        public TempTypeDoesntExistException() { }

        public TempTypeDoesntExistException(String message) {
            super(message);
        }
    }
}