first/jia/chen/chen.h

#ifndef MUL_H
#define MUL_H
#ifdef _DLLAPI
#define DLLAPI _declspec(dllexport)
#else
#define DLLAPI _declspec(dllimport)
#endif
extern "C" int DLLAPI mul(int a, int b);
extern "C" bool DLLAPI chen(int a, int b, int *e);

#endif