數據結構 二叉數的建立與遍歷
遞歸方式遍歷及基本操作
#include<stdio.h>
#include<malloc.h>
#define OVERFLOW 0;
#define ERROR O;
#define OK 1;
typedef char TElemType;
typedef int Status;
typedef struct BiTNode{
TElemType data;
struct BiTNode *lchild,*rchild;
}BiTNode,*BiTree;
Status CreateBiTree(BiTree &T)
{
char ch;
fflush(stdin);
scanf("%c",&ch);
fflush(stdin);
if(ch==' ')T=NULL;
else{
if(!(T=(BiTNode*)malloc(sizeof(BiTNode))))return OVERFLOW;
T->data=ch;
printf("請輸入 %c 的左節點:\n",T->data);
CreateBiTree(T->lchild);
printf("請輸入 %c 的右節點:\n",T->data);
CreateBiTree(T->rchild);
}
}
Status PreOrderTraver(BiTree T,Status(*Visit)(TElemType))//先序遍歷
{
if(T)
{
Visit(T->data);
PreOrderTraver(T->lchild,Visit);
PreOrderTraver(T->rchild,Visit);
}
}
Status InOrderTraverse(BiTree &T,Status(*Visit)(TElemType))//中序遍歷
{
if(T)
{
InOrderTraverse(T->lchild,Visit);
Visit(T->data);
InOrderTraverse(T->rchild,Visit);
}
}
Status PostOrderTraverse(BiTree T,Status(*Visit)(TElemType))//後序遍歷
{
if(T)
{
PostOrderTraverse(T->lchild,Visit);
PostOrderTraverse(T->rchild,Visit);
Visit(T->data);
}
}
//求葉子數
int leafCount(BiTree T)
{
int count1,count2;
if(T==NULL)
return 0;
else
{
if(T->lchild==NULL&&T->rchild==NULL)
return 1;
else
{
count1=leafCount(T->lchild);
count2=leafCount(T->rchild);
return count1+count2;
}
}
}
//***********************************************************************
//求二叉樹每層節點的個數,保存到數組num中
void levelCount(BiTree T,int l,int num[])
{
if(T)
{
num[l]++;
levelCount(T->lchild,l+1,num);
levelCount(T->rchild,l+1,num);
}
}
//***********************************************************************
//求二叉樹的高度
Status heightTree(BiTree T)
{
int h1,h2;
if(T==NULL)
return 0;
else
{
h1=heightTree(T->lchild);
h2=heightTree(T->rchild);
if(h1>h2)return h1+1;
else return h2+1;
}
}
Status PrintElement(TElemType e)
{
printf("%c ",e);
return OK;
}
int main()
{
BiTree T;
printf("請輸入樹根:\n");
CreateBiTree(T);
printf("先序遍歷:\n");
PreOrderTraver(T,PrintElement);
printf("\n中序遍歷:\n");
InOrderTraverse(T,PrintElement);
printf("\n後序遍歷:\n");
PostOrderTraverse(T,PrintElement);
printf("\n該樹的深度是:%d \n",heightTree(T));
}