View Compilation Error

269004_0_14261.cpp
269004_0_14261.cpp(14) : error C2065: “cout” : 未声明的标识符
269004_0_14261.cpp(15) : error C2563: 在形参表中不匹配
269004_0_14261.cpp(15) : error C2568: “<<” : 无法解析函数重载
        VC\include\ostream(928): 可能是“std::basic_ostream<_Elem,_Traits> &std::endl(std::basic_ostream<_Elem,_Traits> &)”
        with
        [
            _Elem=wchar_t,
            _Traits=std::char_traits<wchar_t>
        ]
        VC\include\ostream(920): 或       “std::basic_ostream<_Elem,_Traits> &std::endl(std::basic_ostream<_Elem,_Traits> &)”
        with
        [
            _Elem=char,
            _Traits=std::char_traits<char>
        ]
        VC\include\ostream(896): 或       “std::basic_ostream<_Elem,_Traits> &std::endl(std::basic_ostream<_Elem,_Traits> &)”
269004_0_14261.cpp(15) : error C3861: “cout”: 即使使用参数相关的查找，也未找到标识符