Main.cc: In function 'int main()':
Main.cc:9:20: error: 'underweight' was not declared in this scope
    9 |     if(t<18) cout<<underweight<<endl
      |                    ^~~~~~~~~~~
Main.cc:11:32: error: 'overweight' was not declared in this scope
   11 |     else if(t>=25&&t<27) cout<<overweight<<endl;
      |                                ^~~~~~~~~~
Main.cc:12:16: error: 'obese' was not declared in this scope
   12 |     else cout<<obese<<endl;
      |                ^~~~~