haskell语言的入门经典学习例子。通过这几个例子，可以循序渐进的了解haskell的基本方法、思想。输入输出等。每一个例子都有简略的输入输出的说明文档。-Introduction to language learning haskell classic example. Through these examples, can be a gradual understanding of the basic method of haskell, ideas. Input and output