This is achieved using the reference count of a calculator that can be as basic...

代码说明：

这个是用引用计数实现的一个计算器，可以进行加减乘除等基本运算，同时实现了开方运算，自己扩展了一个操作符。如果需要其他方式的计算，可以方便的自己添加-This is achieved using the reference count of a calculator that can be as basic arithmetic computation. while achieving its-rooting their extended an operator. If other forms of computing, can easily add their own