/in/foo.cc: In function 'int main()':
/in/foo.cc:5:6: warning: variable 'b' set but not used [-Wunused-but-set-variable]
  int b,c,n=0,d,m=0,a;
      ^
/in/foo.cc:5:8: warning: unused variable 'c' [-Wunused-variable]
  int b,c,n=0,d,m=0,a;
        ^