foo.cc: In function ‘int main()’:
foo.cc:8:18: error: expected ‘,’ or ‘;’ before ‘nn’
    8 |         int mm=m nn=n;
      |                  ^~
foo.cc:11:20: error: ‘nn’ was not declared in this scope; did you mean ‘n’?
   11 |                 mm=nn;
      |                    ^~
      |                    n
foo.cc:15:15: error: ‘nn’ was not declared in this scope; did you mean ‘n’?
   15 |         cout<<nn<<endl;
      |               ^~
      |               n