/in/foo.cc: In function 'int main()':
/in/foo.cc:5:8: warning: variable 'b' set but not used [-Wunused-but-set-variable]
  int A,b,c;
        ^
/in/foo.cc:5:10: warning: unused variable 'c' [-Wunused-variable]
  int A,b,c;
          ^