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View Compilation Error

0_0_28517422_25574.cpp: In function 'int main()':
0_0_28517422_25574.cpp:7:11: error: 'cin' was not declared in this scope
     while(cin>>hex>>a>>hex>>b)
           ^
0_0_28517422_25574.cpp:7:11: note: suggested alternative:
In file included from 0_0_28517422_25574.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_28517422_25574.cpp:7:16: error: 'hex' was not declared in this scope
     while(cin>>hex>>a>>hex>>b)
                ^
0_0_28517422_25574.cpp:7:16: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_28517422_25574.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:941:3: note:   'std::hex'
   hex(ios_base& __base)
   ^
0_0_28517422_25574.cpp:8:5: error: 'cout' was not declared in this scope
     cout<<a+b<<endl;
     ^
0_0_28517422_25574.cpp:8:5: note: suggested alternative:
In file included from 0_0_28517422_25574.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_28517422_25574.cpp:8:16: error: 'endl' was not declared in this scope
     cout<<a+b<<endl;
                ^
0_0_28517422_25574.cpp:8:16: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_28517422_25574.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:564:5: note:   'std::endl'
     endl(basic_ostream<_CharT, _Traits>& __os)
     ^


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