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View Compilation Error

0_0_34417888_18897.cpp:6:7: error: expected nested-name-specifier before 'namesp'
 using namesp
       ^
0_0_34417888_18897.cpp: In function 'int main()':
0_0_34417888_18897.cpp:11:8: error: 'cin' was not declared in this scope
  while(cin>>a>>b)
        ^
0_0_34417888_18897.cpp:11:8: note: suggested alternative:
In file included from 0_0_34417888_18897.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_34417888_18897.cpp:13:19: error: 'swap' was not declared in this scope
   if(b>a) swap(a,b);
                   ^
0_0_34417888_18897.cpp:13:19: note: suggested alternatives:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:65:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/random.h:34,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:49,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_34417888_18897.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_bvector.h:128:3: note:   'std::swap'
   swap(bool& __x, _Bit_reference __y) noexcept
   ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/exception:162:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:39,
                 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_34417888_18897.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/exception_ptr.h:160:5: note:   'std::__exception_ptr::swap'
     swap(exception_ptr& __lhs, exception_ptr& __rhs)
     ^
0_0_34417888_18897.cpp:15:15: error: 'g' was not declared in this scope
   if( (int)(k*g) == a )
               ^


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