public State(StateTypeEnum stateType, int leftOperand, int rightOperand, StateOperatorEnum op)
{
this.StateType = stateType;
this.LeftOperand = leftOperand;
this.RightOperand = rightOperand;
this.Operator = op;
}
private State OnOperator(StateOperatorEnum op)
{
switch (this.StateType)
{
case StateTypeEnum.Left:
case StateTypeEnum.Operator:
case StateTypeEnum.Enter:
return(new State(StateTypeEnum.Operator, this.LeftOperand, this.RightOperand, op));
case StateTypeEnum.Right:
if (op == StateOperatorEnum.Div && this.RightOperand == 0)
{
return(this);
}
else
{
return(this.OnEnter().OnOperator(op));
}
default:
return(this);
}
}
