Owl Get a Life

Compile Error

addition.cpp:2:7: error: expected nested-name-specifier before ‘nameplate’
2 | using nameplate std;
| ^~~~~~~~~
cc1plus: error: ‘::main’ must return ‘int’
addition.cpp: In function ‘int main()’:
addition.cpp:8:2: error: ‘cin’ was not declared in this scope; did you mean ‘std::cin’?
8 | cin >> a >> b
| ^~~
| std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:75,
from addition.cpp:1:
/usr/include/c++/9/iostream:60:18: note: ‘std::cin’ declared here
60 | extern istream cin; /// Linked to standard input
| ^~~