/in/foo.cc: In function 'int suan(int, int)':
/in/foo.cc:12:11: warning: unused variable 'id' [-Wunused-variable]
       int id=d;
           ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:32:15: warning: 'ys' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<fz/ys<<' '<<fm/ys<<endl;
               ^~~