二叉树的层次遍历算法

#include <stdio.h>
#include "btreee.h"

void LevelOrder(BTNode *b)
{
BTNode *p;
BTNode *qu[MaxSize];    //定义环形队列,存放节点指针
int front,rear; //定义队头和队尾指针
front=rear=-1;      //置队列为空队列
rear++;
qu[rear]=b;     //根节点指针进入队列
while (front!=rear) //队列不为空
{
front=(front+1)%MaxSize;
p=qu[front];        //队头出队列
printf("%c ",p->data);  //访问节点
if (p->lchild!=NULL)    //有左孩子时将其进队
{
rear=(rear+1)%MaxSize;
qu[rear]=p->lchild;
}
if (p->rchild!=NULL)    //有右孩子时将其进队
{
rear=(rear+1)%MaxSize;
qu[rear]=p->rchild;
}
}
}

int main()
{
BTNode *b;
CreateBTNode(b,"A(B(D,E(H(J,K(L,M(,N))))),C(F,G(,I)))");
printf("二叉树b: ");
DispBTNode(b);
printf("\n");
printf("层次遍历序列:\n");
LevelOrder(b);
DestroyBTNode(b);
return 0;
}