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View Compilation Error

0_0_15826918_24811.cpp:2:1: error: 'usng' does not name a type
 usng namespace std;
 ^
0_0_15826918_24811.cpp: In function 'int main()':
0_0_15826918_24811.cpp:5:1: error: 'cin' was not declared in this scope
 cin>>a>>b;
 ^
0_0_15826918_24811.cpp:5:1: note: suggested alternative:
In file included from 0_0_15826918_24811.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_15826918_24811.cpp:7:2: error: 'cout' was not declared in this scope
 {cout<<a+b<<endl;
  ^
0_0_15826918_24811.cpp:7:2: note: suggested alternative:
In file included from 0_0_15826918_24811.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_15826918_24811.cpp:7:13: error: 'endl' was not declared in this scope
 {cout<<a+b<<endl;
             ^
0_0_15826918_24811.cpp:7:13: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_15826918_24811.cpp:1:
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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