View Compilation Error

0_0_21982679_30910.cpp
0_0_21982679_30910.cpp(19) : error C2065: “cout”: 未声明的标识符
0_0_21982679_30910.cpp(20) : error C2065: “cout”: 未声明的标识符
0_0_21982679_30910.cpp(20) : error C2563: 在形参表中不匹配
0_0_21982679_30910.cpp(20) : error C2568: “<<”: 无法解析函数重载
        VC2013\INCLUDE\ostream(997): 可能是“std::basic_ostream<_Elem,_Traits> &std::endl(std::basic_ostream<_Elem,_Traits> &)”