public SentenceExpressionSelfAssign(SentenceExpression left, SentenceExpression right, IValueCalculate calculate):
base(left, right, calculate) {
}
public SentenceExpressionDouble(SentenceExpression variableExpresison, IValueCalculate calculate, bool last) {
_variableExpresison = variableExpresison;
_calculate = calculate;
_bLast = last;
}
public ShoppingCart(IValueCalculate calcParam)
{
calc = calcParam;
}