/in/foo.cc: In function 'int main()':
/in/foo.cc:15:6: warning: unused variable 'Q1' [-Wunused-variable]
  int Q1=1,Q2=1,now=0;
      ^~
/in/foo.cc:15:11: warning: unused variable 'Q2' [-Wunused-variable]
  int Q1=1,Q2=1,now=0;
           ^~
/in/foo.cc:15:16: warning: unused variable 'now' [-Wunused-variable]
  int Q1=1,Q2=1,now=0;
                ^~~