fun.h

表达式类型的实现: 1、 一个表达式和一颗二叉树之间

#define OK 1
typedef int Status;

typedef struct ThrNode{
	char data;
	struct ThrNode *lchild,*rchild;
}ThrNode,*Tree;
extern char a[80];
extern char b[40];
extern int k;
//extern Tree E;
Status CreateTree(Tree &T);
Status InitTree(Tree &T);
Status Assign(Tree &T,char v,char c);
Status ReadExpr(Tree &T);
Status WriteExpr(Tree T);
Status Value(Tree T);
Tree CompoundExpr(char P,Tree E1,Tree E2);