将中缀表达式改变为逆波兰式 ，并输出计算结果。可以计算+.-.*./.()运算。程序比较简单，说是计算器其实是在dos界面下输入表达式最后加一个# ，然后按enter建即可得到结果。-Infix expression to Reverse Polish change, and output results. Can be calculated+.-.*./.() operations. Procedure is relatively simple, said the calculator is in fact the last input expression dos interface plus a#, then press enter building to get results.