public override decimal Calc()
{
decimal R = RightSide.Calc();
decimal L = LeftSide.Calc();
if (OperatorsType.Addition == ThisOperatorsType)
{
return(L + R);
}
else if (OperatorsType.Division == ThisOperatorsType)
{
return(L / R);
}
else if (OperatorsType.Subtraction == ThisOperatorsType)
{
return(L - R);
}
else if (OperatorsType.Multiplication == ThisOperatorsType)
{
return(L * R);
}
else
{
MessageBox.Show("エラー");
return(0);
}
}