3.cpp

该程序是一个二叉数遍历的程序。其中可将程序以前

#include<stdio.h>
#include<stdlib.h>
//#define n 20
typedef struct BiTNode{
  char data;
  struct BiTNode *lchild,*rchild;
}BiTNode,*BiTree;

struct BiTNode * createtree(struct BiTNode * *p ,char a1);
void treave(struct BiTNode *p);
void treave1(struct BiTNode *p);
void treave2(struct BiTNode *p);

void main()
{
	char a1;
	struct BiTNode * tree;
	tree=NULL;
	printf("\n\n\n\n\t\t *******************************************\n");
	printf("\t\t *\t输入字符串:");
	while(scanf("%c",&a1))
	{
		if(a1=='\n') break ;
		createtree(&tree,a1);	
	}
	printf("\n\n\n\t\t* \t中序输出:");
	treave(tree);
	printf("\n\n\n\t\t* \t前序输出:");
	treave1(tree);
	printf("\n\n\n\t\t* \t后序输出:");
	treave2(tree);
	printf("\n");
	printf("\n\t\t *******************08.5.11*** make by gfc **\n");
	getchar();

}
struct BiTNode * createtree(struct BiTNode * *p ,char a1)
{
	if(*p==NULL)
	{
		*p=(struct BiTNode *)malloc(sizeof(struct BiTNode));
		(*p)->data=a1;
		(*p)->lchild=(*p)->rchild=NULL;
	}
	else if(a1<(*p)->data)
		createtree(&(*p)->lchild,a1);
	else createtree(&(*p)->rchild,a1);

	return(*p);	
}


void treave(struct BiTNode *p)
{
		if(p!=NULL)
		{
			treave(p->lchild);
			printf(" %c ",p->data);
			treave(p->rchild);
		}
}

void treave1(struct BiTNode *p)
{
		if(p!=NULL)
		{
			printf(" %c ",p->data);
			treave(p->lchild);
			treave(p->rchild);
		}
}

void treave2(struct BiTNode *p)
{
		if(p!=NULL)
		{
			treave(p->lchild);			
			treave(p->rchild);
			printf(" %c ",p->data);
		}
}