摘要:
本程序主要实现加法和减法2种运算,要实现别的运算请扩展该运算方法和修改操作工厂类!操作类: class Operation { public double NumberA { get; set; } public double NumberB { get; set; } public virtual double getResult() { return 0.0; } } class OperationAdd : Operation { public ... 阅读全文