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View Compilation Error

0_0_37920548_7329.cpp: In function 'int main()':
0_0_37920548_7329.cpp:3:2: error: 'string' was not declared in this scope
  string s1,s2;
  ^
0_0_37920548_7329.cpp:3:2: 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++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_37920548_7329.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_37920548_7329.cpp:4:8: error: 'cin' was not declared in this scope
  while(cin>>s1 && s1!="#"){
        ^
0_0_37920548_7329.cpp:4:8: 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_37920548_7329.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_37920548_7329.cpp:4:13: error: 's1' was not declared in this scope
  while(cin>>s1 && s1!="#"){
             ^
0_0_37920548_7329.cpp:5:8: error: 's2' was not declared in this scope
   cin>>s2;
        ^


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