/**
 * A simple utility class to convert temperatures between degrees
 * Celcius and degrees Fahrenheit.
 * 
 * @author EECS1030_W15
 *
 */
public class TemperatureUtil {
  /**
   * Number of degrees Fahrenheit in one degree Celcius. By definition,
   * this value is equal to (9.0 / 5.0).
   */
  public static final double DEG_F_PER_DEG_C = 9.0 / 5.0;
  
  /**
   * Number of degrees Celcius in one degree Fahrenheit. By definition,
   * this value is equal to (5.0 / 9.0).
   */
  public static final double DEG_C_PER_DEG_F = 5.0 / 9.0;
  
  /**
   * Number of degrees Fahrenheit at zero degrees Celcius.
   */
  private static final double ZERO_OFFSET = 32.0;
  
  
  /**
   * Converts degrees Fahrenheit to degrees Celcius.
   * 
   * @param degf temperature in degrees Fahrenheit
   * @return temperature in degrees Celcius
   */
  public static double fahrenheitToCelcius(double degf) {
    return (degf - ZERO_OFFSET) * DEG_C_PER_DEG_F;
  }
  
  /**
   * Converts degrees Celcius to degrees Fahrenheit.
   * 
   * @param degc temperature in degrees Celcius
   * @return temperature in degrees Fahrenheit
   */
  public static double celciusToFahrenheit(double degc) {
    return degc * DEG_F_PER_DEG_C + ZERO_OFFSET;
  }
  
  private TemperatureUtil() {
  }
  
  public static void main(String[] args) {
    System.out.println(TemperatureUtil.celciusToFahrenheit(-78));
  }
}