public static GradeLevels GradeAbove(this GradeLevels grade)
{
int raw = (int)grade;
if (grade.IsSingleGrade() && raw < (int)GradeLevels.Grade12)
{
return((GradeLevels)(raw << 1));
}
return(GradeLevels.NA);
}
public static GradeLevels GradeBelow(this GradeLevels grade)
{
return(grade.IsSingleGrade()
? (GradeLevels)((int)grade >> 1)
: GradeLevels.NA);
}