/in/foo.cc: In function 'int main()':
/in/foo.cc:7:14: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses]
    7 |         if(!n==4) cout<<3;
      |              ^~
/in/foo.cc:7:12: note: add parentheses around left hand side expression to silence this warning
    7 |         if(!n==4) cout<<3;
      |            ^~
      |            ( )
/in/foo.cc:7:14: warning: comparison of constant '4' with boolean expression is always false [-Wbool-compare]
    7 |         if(!n==4) cout<<3;
      |            ~~^~~