public double Calculate(NumberPair pair)
{
int number1 = pair.Number1;
int number2 = pair.Number2;
switch (Name)
{
case Operator.Plus:
return(number1 + number2);
case Operator.Minus:
return(number1 - number2);
case Operator.Multiplication:
return(number1 * number2);
case Operator.Division:
{
if (number2 == 0)
{
throw new DivideByZeroException();
}
return((double)number1 / number2);
}
default:
throw new Exception("unexpected operator");
}
}
public bool IsValid(NumberPair pair)
{
if (Name == Operator.Division && pair.Number2 == 0)
{
return(false);
}
return(true);
}
