怎么用fix函数来求一个浮点数的精度？fix函数和int函数都没把多余的尾数去掉请问是怎么回事，怎么去掉多余的浮点数的尾数？
http://baike.baidu.com/link?url=BwlGiuc2aEb7fyN_1z7zwBsDPNY6FRZcFRka5kKZeOeYUgqOJsLW-66wRyGLvrZrJNrTQLjSmZCvD8N3NsTAa6XZoadIyGShSjrs-aCWg9i