电子书我也有。。可惜看上去眼睛受不了啊。
Murphy's Law :
If there are two or more ways to do something, and one of those ways can result in a catastrophe, then someone will do it.
考虑一下：流程控制用LR应该会很简单……
表达式单独抽出来算符优先得了……反正手上有现成代码……
词法分析用C++的stringstream……
合起来，应该不会很难吧……
