source.cpp: In function ‘int main()’:
source.cpp:4:2: error: ‘cin’ was not declared in this scope; did you mean ‘std::cin’?
4 | cin>>n;
| ^~~
| std::cin
In file included from source.cpp:1:
/usr/include/c++/9.2.0/iostream:60:18: note: ‘std::cin’ declared here
60 | extern istream cin; /// Linked to standard input
| ^~~
source.cpp:15:2: error: ‘cout’ was not declared in this scope; did you mean ‘std::cout’?
15 | cout<<val<<endl;
| ^~~~
| std::cout
In file included from source.cpp:1:
/usr/include/c++/9.2.0/iostream:61:18: note: ‘std::cout’ declared here
61 | extern ostream cout; /// Linked to standard output
| ^~~~
source.cpp:15:13: error: ‘endl’ was not declared in this scope; did you mean ‘std::endl’?
15 | cout<<val<<endl;
| ^~~~
| std::endl
In file included from /usr/include/c++/9.2.0/iostream:39,
from source.cpp:1:
/usr/include/c++/9.2.0/ostream:599:5: note: ‘std::endl’ declared here
599 | endl(basic_ostream<_CharT, _Traits>& __os)
| ^~~~
im having these errors while running code editor can you help