C#编写的计算器程序，使用了堆栈实现，支持表达式计算-Calculator program written in C#, using a stack implementation, support for expression evaluation

c#计算器实现,通过堆栈，将中序表达式变换为后序表达式，在利用转换来的后序表达式完成计算。-c# calculator achieved through the stack, the sequence expression is converted into a sequence expression is calculated using the conversion to be completed after the sequence expression.