View Compilation Error

0_0_7578147_21214.cpp
0_0_7578147_21214.cpp(11) : error C2065: “N” : 未声明的标识符
0_0_7578147_21214.cpp(11) : error C2676: 二进制“&&” : “std::basic_istream<_Elem,_Traits>::_Myt”不定义该运算符或到预定义运算符可接收的类型的转换
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
0_0_7578147_21214.cpp(11) : fatal error C1903: 无法从以前的错误中恢复；正在停止编译