public void AddReading(Reading newReading)
 {
     // add reading to end of array
     int i = 0;
     while (readings[i] != null) i++;
     readings[i] = newReading;
 }
 public void AddReading(Reading newReading)
 {
     Reading[] newArray = new Reading[readings.Length + 1];
     Array.Copy(readings, 0, newArray, 1, readings.Length);
     newArray[0] = newReading;
     readings = newArray;
 }
 public void AddReading(Reading newReading)
 {
     int i;
     for (i = 0; readings[i] != null; i++) ;
     readings[i] = newReading;
 }
 public void AddReading(Reading newReading)
 {
     readings[++lastReading] = newReading;
 }