/in/foo.cc: In function 'int main()':
/in/foo.cc:20:8: warning: unused variable 'w' [-Wunused-variable]
  int t,w,n,z,y,tot=0,m;
        ^
/in/foo.cc:20:12: warning: unused variable 'z' [-Wunused-variable]
  int t,w,n,z,y,tot=0,m;
            ^
/in/foo.cc:20:14: warning: unused variable 'y' [-Wunused-variable]
  int t,w,n,z,y,tot=0,m;
              ^
/in/foo.cc:21:11: warning: unused variable 'b' [-Wunused-variable]
  double l,b=0;
           ^