fstream ----- 支持输入输出----- 必须指定类型 ： ios_base:in out app等，不指定会失败。
ofstream ----- 支持输出
ifstream ----- 支持输入
some function;
open
close
is_open
getline
eof
_(\_/)
,((((^`
(((( (6
,((((( ,
,,,_ ,((((( /"._ ,`,
((((\ ,... ,(((( / `-.-'
))) ;' `"'"'""(((( (
((( / (((
)) | |
(( | . ' |
)) _ ' `t ,.')
( | y;- -,-""'"-. /
) / ./ ) / `
|./ ( ( / /'
|| \ //'|
|| \ _//'||
|| )) |_/ ||
\_ |_/ ||
`'" \_
`'"
---------------------------
26000000025000000000240000200100220000001040020000140000002000020000100000010000700000304000000100020040000000000030000020120006001001022000020807050000205010600300000030300010000000000300003010020109002003000301011010003005001000000300600700000003007005000200030005000100003000180000240000---------------------------
_(\_/)
,((((^`
(((( (6
,((((( ,
,,,_ ,((((( /"._ ,`,
((((\ ,... ,(((( / `-.-'
))) ;' `"'"'""(((( (
((( / (((
)) | |
(( | . ' |
)) _ ' `t ,.')
( | y;- -,-""'"-. /
) / ./ ) / `
|./ ( ( / /'
|| \ //'|
|| \ _//'||
|| )) |_/ ||
\_ |_/ ||
`'" \_
`'"