foo.cc: In function 'int main()':
foo.cc:8:19: error: 'n510' was not declared in this scope
    8 |                 a=n510;
      |                   ^~~~
foo.cc:13:45: error: expected ';' before '}' token
   13 |                                 cout<<n<<" "
      |                                             ^
      |                                             ;
   14 |                         }
      |                         ~