/in/foo.cc: In function 'int main()':
/in/foo.cc:6:8: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |  while(cin>>n)
      |        ^~~
      |        std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:75,
                 from /in/foo.cc:1:
/usr/include/c++/9/iostream:60:18: note: 'std::cin' declared here
   60 |   extern istream cin;  /// Linked to standard input
      |                  ^~~
/in/foo.cc:9:3: error: 'chars' was not declared in this scope; did you mean 'char'?
    9 |   chars[4];
      |   ^~~~~
      |   char
/in/foo.cc:10:11: error: 's' was not declared in this scope
   10 |    sprinf(s,"02d%",i);
      |           ^
/in/foo.cc:10:4: error: 'sprinf' was not declared in this scope; did you mean 'sprintf'?
   10 |    sprinf(s,"02d%",i);
      |    ^~~~~~
      |    sprintf
/in/foo.cc:11:4: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   11 |    cout<<setw(5)<<s;
      |    ^~~~
      |    std::cout
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:75,
                 from /in/foo.cc:1:
/usr/include/c++/9/iostream:61:18: note: 'std::cout' declared here
   61 |   extern ostream cout;  /// Linked to standard output
      |                  ^~~~
/in/foo.cc:11:10: error: 'setw' was not declared in this scope; did you mean 'std::setw'?
   11 |    cout<<setw(5)<<s;
      |          ^~~~
      |          std::setw
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
                 from /in/foo.cc:1:
/usr/include/c++/9/iomanip:225:3: note: 'std::setw' declared here
  225 |   setw(int __n)
      |   ^~~~
/in/foo.cc:12:20: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   12 |    if(i%n==0)cout<<endl;
      |                    ^~~~
      |                    std::endl
In file included from /usr/include/c++/9/istream:39,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from /in/foo.cc:1:
/usr/include/c++/9/ostream:599:5: note: 'std::endl' declared here
  599 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
/in/foo.cc:14:2: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   14 |  cout<<endl;
      |  ^~~~
      |  std::cout
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:75,
                 from /in/foo.cc:1:
/usr/include/c++/9/iostream:61:18: note: 'std::cout' declared here
   61 |   extern ostream cout;  /// Linked to standard output
      |                  ^~~~
/in/foo.cc:14:8: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   14 |  cout<<endl;
      |        ^~~~
      |        std::endl
In file included from /usr/include/c++/9/istream:39,
                 from /usr/include/c++/9/sstream:38,
                 from /usr/include/c++/9/complex:45,
                 from /usr/include/c++/9/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
                 from /in/foo.cc:1:
/usr/include/c++/9/ostream:599:5: note: 'std::endl' declared here
  599 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~