the difference between fopen&open

［the difference between fopen&open］

　　fopen是C标准API，open是linux系统调用，层次上fopen基于open，在其之上。fopen有缓存，open无缓存，对于顺序读取，fopen更高效。

　　参考：http://www.cnblogs.com/joeblackzqq/archive/2011/04/11/2013010.html