/in/foo.cc: In function 'int main()':
/in/foo.cc:32:19: error: invalid conversion from 'int' to 'std::basic_istream<char>::char_type* {aka char*}' [-fpermissive]
   cin.getline(n1,1);
                   ^
In file included from /usr/include/c++/5/iostream:40:0,
                 from /in/foo.cc:1:
/usr/include/c++/5/istream:427:7: note:   initializing argument 1 of 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::getline(std::basic_istream<_CharT, _Traits>::char_type*, std::streamsize) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::char_type = char; std::streamsize = long int]'
       getline(char_type* __s, streamsize __n)
       ^
/in/foo.cc:35:21: error: no matching function for call to 'std::basic_istream<char>::getline(int*&, int&)'
   cin.getline(arr,n1);
                     ^
In file included from /usr/include/c++/5/iostream:40:0,
                 from /in/foo.cc:1:
/usr/include/c++/5/istream:647:5: note: candidate: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::getline(std::basic_istream<_CharT, _Traits>::char_type*, std::streamsize, std::basic_istream<_CharT, _Traits>::char_type) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::char_type = char; std::streamsize = long int]
     basic_istream<char>::
     ^
/usr/include/c++/5/istream:647:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/5/istream:427:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::getline(std::basic_istream<_CharT, _Traits>::char_type*, std::streamsize) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::char_type = char; std::streamsize = long int]
       getline(char_type* __s, streamsize __n)
       ^
/usr/include/c++/5/istream:427:7: note:   no known conversion for argument 1 from 'int*' to 'std::basic_istream<char>::char_type* {aka char*}'
/in/foo.cc:41:2: error: expected ';' before '}' token
  }
  ^
/in/foo.cc:29:6: warning: unused variable 'n1' [-Wunused-variable]
  int n1;
      ^