// To sort exercises, e.g. in the exercise list, sort them by exercise number
public int CompareTo(Exercise other)
{
if (ChapterNo != other.ChapterNo)
{
throw new InvalidOperationException("Can only compare two exercises with each other if they are both in the same chapter");
}
return(ExerciseNo.CompareTo(other.ExerciseNo));
}
public override int GetHashCode()
{
unchecked // Overflow is fine, just wrap
{
int hash = 17;
hash = hash * 23 + ChapterNo.GetHashCode();
hash = hash * 23 + ExerciseNo.GetHashCode();
return(hash);
}
}
