/in/foo.cc: In function 'int main()':
/in/foo.cc:30:10: warning: unused variable 's' [-Wunused-variable]
  int A,B,s=0,i;
          ^
/in/foo.cc:30:14: warning: unused variable 'i' [-Wunused-variable]
  int A,B,s=0,i;
              ^