1*67e74705SXin Li #ifndef E_H 2*67e74705SXin Li #define E_H 3*67e74705SXin Li #define HEADER "a.h" 4*67e74705SXin Li #include HEADER 5*67e74705SXin Li #include "b.h" 6*67e74705SXin Li const int e = a*b; 7*67e74705SXin Li #endif 8