/in/foo.cc: In function 'int main()':
/in/foo.cc:9:8: warning: variable 'd' set but not used [-Wunused-but-set-variable]
  int c,d; cin>>c; 
        ^
/in/foo.cc: In function 'int XiongKaiZhuanYong(int)':
/in/foo.cc:31:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^