View Compilation Error

0_0_37494777_27493.cpp:2:1: error: 'uding' does not name a type
 uding namespace std;
 ^
0_0_37494777_27493.cpp: In function 'int main()':
0_0_37494777_27493.cpp:6:2: error: 'cin' was not declared in this scope
  cin>>a>>b;
  ^
0_0_37494777_27493.cpp:6:2: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_37494777_27493.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_37494777_27493.cpp:7:2: error: 'cout' was not declared in this scope
  cout<<a+b;
  ^
0_0_37494777_27493.cpp:7:2: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:74:0,
                 from 0_0_37494777_27493.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^