树的先序，中序，后序递归遍历
//树的先序、中序、后序遍历递归
#include<bits/stdc++.h>
typedef struct node
{
char data;
struct node *lchild,*rchild;
}BTNode;
void Greate(BTNode *&T)
{
char ch;
scanf("%c",&ch);
if(ch=='#') T=NULL;
else
{
T=(BTNode*)malloc(sizeof(BTNode));
T->data=ch;
Greate(T->lchild);
Greate(T->rchild);
}
}
//先序遍历
void PreOrder(BTNode *T)
{
if(T!=NULL)
{
printf("%c",T->data);
PreOrder(T->lchild);
PreOrder(T->rchild);
}
}
//中序遍历
void InOrder(BTNode *T)
{
if(T!=NULL)
{
InOrder(T->lchild);
printf("%c",T->data);
InOrder(T->rchild);
}
}
void PostOrder(BTNode *T)
{
if(T!=NULL)
{
PostOrder(T->lchild);
PostOrder(T->rchild);
printf("%c",T->data);
}
}
int main()
{
BTNode *T;
Greate(T);
printf("先序遍历：");
PreOrder(T);
printf("\n");
printf("中序遍历：");
InOrder(T);
printf("\n");
printf("后序遍历：");
PostOrder(T);
return 0;
}
输入:AB#D##C#F##
输出:
先序遍历:ABDCF
中序遍历:BDACF
后序遍历:DBFCA