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View Compilation Error

0_0_36653256_23655.cpp:2:1: error: 'usingnamespace' does not name a type
 usingnamespace std;
 ^
0_0_36653256_23655.cpp: In function 'int main()':
0_0_36653256_23655.cpp:4:4: error: 'string' was not declared in this scope
    string s = "HDU";
    ^
0_0_36653256_23655.cpp:4:4: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iosfwd:39:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:38,
                 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_36653256_23655.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stringfwd.h:62:33: note:   'std::string'
   typedef basic_string<char>    string;   
                                 ^
0_0_36653256_23655.cpp:6:4: error: 'cin' was not declared in this scope
    cin>>a;
    ^
0_0_36653256_23655.cpp:6:4: note: suggested alternative:
In file included from 0_0_36653256_23655.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_36653256_23655.cpp:10:4: error: 'cout' was not declared in this scope
    cout<<s;
    ^
0_0_36653256_23655.cpp:10:4: note: suggested alternative:
In file included from 0_0_36653256_23655.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_36653256_23655.cpp:10:10: error: 's' was not declared in this scope
    cout<<s;
          ^
0_0_36653256_23655.cpp:12:1: error: 'cout' was not declared in this scope
 cout<<endl;
 ^
0_0_36653256_23655.cpp:12:1: note: suggested alternative:
In file included from 0_0_36653256_23655.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_36653256_23655.cpp:12:7: error: 'endl' was not declared in this scope
 cout<<endl;
       ^
0_0_36653256_23655.cpp:12:7: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_36653256_23655.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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