小弟玩ubuntu几个月了，最近在ubuntu上装了个编译器。
在geit中写入C++代码如下：
#include <iostream>
using namespace std;
int main()
{
int x,y;
cin>>x>>"">>y>>endl;
if(x>y)
cout<<x<<">"<<y<<endl;
else
cout<<x<<"<"<<y<<endl;
return 0;
}

用g++ －Wall filename.cpp不能编译成功
终端提示如下：
storm@storm-desktop:~$ g++ -Wall 555.cpp
555.cpp: In function ‘int main()’:
555.cpp:6: 错误： no match 为‘operator>>’在‘std::cin.std::basic_istream<_CharT, _Traits>::operator>> [with _CharT = char, _Traits = std::char_traits<char>](((int&)(& x))) >> ""’中
/usr/include/c++/4.3/istream:123: 附注： 备选为： std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>& (*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:127: 附注： std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:134: 附注： std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:170: 附注： std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:174: 附注： std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.3/istream:177: 附注： std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>]


但是不用cin语句，如以下代码就可以执行
#include <iostream>
using namespace std;
int main()
{
int x＝3,y＝5;
if(x>y)
cout<<x<<">"<<y<<endl;
else
cout<<x<<"<"<<y<<endl;
return 0;
}

用g++编译能产生a.out文件
./a.out 后会正常显示
3<5.

这个问题我百思不得其解，望各位大虾不吝赐教。

1. 你不妨先解释一下你在代码中添加 "" 和 endl 本意是什么？或者你想做什么

2. 找本C++ 的书好好看看

额。。。我知道什么原因了，
多了个endl。
谢谢楼上的提醒！！

呵呵。估计是习惯性粘贴的。