foo.cc: In function ‘int main()’:
foo.cc:14:40: error: expected primary-expression before ‘return’
   14 |                         cout<<-i<<endl,return 0;
      |                                        ^~~~~~
foo.cc:18:15: error: ‘tmp’ was not declared in this scope; did you mean ‘tm’?
   18 |         cout<<tmp<<endl;
      |               ^~~
      |               tm