6--树的遍历

#include <stdio.h>
#define ElemType char

//节点声明，数据域、左孩子指针、右孩子指针
typedef struct BiTNode{
    char data;
    struct BiTNode *lchild,*rchild;
}BiTNode,*BiTree;

//先序建立二叉树
BiTree CreateBiTree()
{
    char ch;
    BiTree T;
    scanf("%c",&ch);
    if(ch=='#')
        T = NULL;
    else
    {
        T = (struct BiTNode *)malloc(sizeof(struct BiTNode));
        T->data = ch;
        T->lchild = CreateBiTree();
        T->rchild = CreateBiTree();
    }

    return T;//返回根节点
}
//先序遍历二叉树
void PreOrderTraverse(BiTree T){
    if(T){
       printf("%c",T->data);
       PreOrderTraverse(T->lchild);
       PreOrderTraverse(T->rchild);
    }
}
 
//中序遍历
void InOrderTraverse(BiTree T){
    if(T){
       PreOrderTraverse(T->lchild);
       printf("%c",T->data);
       PreOrderTraverse(T->rchild);
    }
}
//后序遍历
void PostOrderTraverse(BiTree T){
    if(T)
    {
       PreOrderTraverse(T->lchild);
       PreOrderTraverse(T->rchild);
       printf("%c",T->data);
    }
}
int main()
{
    BiTree T;
    T = CreateBiTree();//建立
    PreOrderTraverse(T);//输出

    return 0;
}