/in/foo.cc: In function 'int main()':
/in/foo.cc:10:15: error: expected unqualified-id before 'char'
   10 |         int n,char r;cin>>n;r=n;n=r;cout<<n;
      |               ^~~~
/in/foo.cc:10:29: error: 'r' was not declared in this scope
   10 |         int n,char r;cin>>n;r=n;n=r;cout<<n;
      |                             ^