本代码可以对一般的中缀式进行转化，转为前缀式，后缀式并分别对它们求值。该程序是在vs2010上调试通过的，而且只有源代码。-This code can in general infix style was transformed into a type prefix, postfix and evaluate them separately. The program is in vs2010 debugging through, and only the source code.