24点游戏 (c/c++)

struct nod { struct nod *left,*right; unsigned char operatie; union { double valoare; CString *valoarestr;}; } ; typedef nod NOD; typedef nod *arbore; arbore CloneTree(void); int UpdateArbore(void); arbore GetArbore(); int Value(double & valoare); // 得到表达式的值 int ChangeExpress