Main.cc: In function 'int main()':
Main.cc:5:11: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |     while(cin>>x;){
      |           ^~~
      |           std::cin
In file included from Main.cc:1:
/usr/include/c++/12.2.1/iostream:60:18: note: 'std::cin' declared here
   60 |   extern istream cin;           /// Linked to standard input
      |                  ^~~
Main.cc:5:17: error: expected ')' before ';' token
    5 |     while(cin>>x;){
      |          ~      ^
      |                 )
Main.cc:5:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
    5 |     while(cin>>x;){
      |     ^~~~~
Main.cc:5:18: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
    5 |     while(cin>>x;){
      |                  ^
Main.cc:5:18: error: expected primary-expression before ')' token
Main.cc:10:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |     cout<<sum<<endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/12.2.1/iostream:61:18: note: 'std::cout' declared here
   61 |   extern ostream cout;          /// Linked to standard output
      |                  ^~~~
Main.cc:10:16: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   10 |     cout<<sum<<endl;
      |                ^~~~
      |                std::endl
In file included from /usr/include/c++/12.2.1/iostream:39:
/usr/include/c++/12.2.1/ostream:688:5: note: 'std::endl' declared here
  688 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~