View Compilation Error

1_277_398_23331.cpp
1_277_398_23331.cpp(28) : error C2146: 语法错误 : 缺少“;”(在标识符“f”的前面)
1_277_398_23331.cpp(28) : error C2563: 在形参表中不匹配
1_277_398_23331.cpp(28) : 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> &)”