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View Compilation Error

0_0_36177792_1331.cpp: In function 'int main()':
0_0_36177792_1331.cpp:7:9: error: 'cin' was not declared in this scope
  while (cin >> a)
         ^
0_0_36177792_1331.cpp:7:9: note: suggested alternative:
In file included from 0_0_36177792_1331.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^
0_0_36177792_1331.cpp:9:29: error: 'pow' was not declared in this scope
   float v= 4 * PI * pow(a, 3);
                             ^
0_0_36177792_1331.cpp:10:3: error: 'cout' was not declared in this scope
   cout.setf(ios_base::fixed, ios_base::floatfield);
   ^
0_0_36177792_1331.cpp:10:3: note: suggested alternative:
In file included from 0_0_36177792_1331.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^
0_0_36177792_1331.cpp:10:13: error: 'ios_base' has not been declared
   cout.setf(ios_base::fixed, ios_base::floatfield);
             ^
0_0_36177792_1331.cpp:10:30: error: 'ios_base' has not been declared
   cout.setf(ios_base::fixed, ios_base::floatfield);
                              ^
0_0_36177792_1331.cpp:11:13: error: 'ios_base' has not been declared
   cout.setf(ios_base::showpoint);
             ^
0_0_36177792_1331.cpp:13:16: error: 'endl' was not declared in this scope
   cout << v << endl;
                ^
0_0_36177792_1331.cpp:13:16: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_36177792_1331.cpp:2:
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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