1 删除文件

https://zhidao.baidu.com/question/198859426.html

2 fgets函数会读到\n

https://blog.csdn.net/daiyutage/article/details/8540932

3arraylist c实现

字符串

http://www.cnblogs.com/hibraincol/archive/2011/10/15/2212997.html