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层次便利需要一个队列来辅助保存节点信息

代码

#include<stdio.h>
#include<stdlib.h>
typedef char ElemType;//树
typedef struct trees{ElemType data;struct trees*lc;struct trees*rc;
}treeNode,*Tree;//链表
typedef struct Links{Tree tree;struct Links*next;
}LNode,*LinkList;//队列
typedef struct{LinkList front;LinkList rear;
}LinkQue;void init_que(LinkQue&q)
{q.front=q.rear=(LinkList)calloc(1,sizeof(LNode));q.front=q.rear;
}bool isEmpty(LinkQue&q)
{return q.front == q.rear;
}//入队
void push_que(LinkQue&q,Tree tree)
{//新建链表节点LinkList newList = (LinkList)calloc(1,sizeof(LNode));newList->next=NULL;newList->tree=tree;q.rear->next=newList;q.rear=q.rear->next;
}
bool pop_que(LinkQue&q,Tree &tree)
{if(isEmpty(q)){return false;}LinkList del = q.front->next;//头结点不存数据，第一个节点才是真的数据起始位置q.front->next=del->next;//断链tree=del->tree;if(q.rear == del)//只剩下尾节点的数据{q.rear=q.front;//置空}free(del);return true;
}void build_tree(Tree&tree)
{LinkQue q;init_que(q);LinkList cur = NULL;ElemType data;while(scanf("%c",&data) && data != '\n'){Tree newTree = (Tree)calloc(1,sizeof(treeNode));//申请新的树的节点newTree->data=data;if(tree == NULL){tree = newTree;push_que(q,tree);//入队cur = q.rear;}else{if(cur->tree->lc == NULL){cur->tree->lc = newTree;push_que(q,newTree);}else{cur->tree->rc = newTree;push_que(q,newTree);//改变当前父亲节点cur = cur->next;}}}
}void pre_print(Tree t)
{if(t){putchar(t->data);pre_print(t->lc);pre_print(t->rc);}
}
void mid_print(Tree t)
{if(t){mid_print(t->lc);putchar(t->data);mid_print(t->rc);}
}
void post_print(Tree t)
{if(t){post_print(t->lc);post_print(t->rc);putchar(t->data);}
}void level_print(Tree t)
{Tree cur;LinkQue q;//队列建立init_que(q);push_que(q,t);//树根入队while(!isEmpty(q))//队列不为空{//出队pop_que(q,cur);putchar(cur->data);if(cur->lc){push_que(q,cur->lc);//左子树入队}if(cur->rc){push_que(q,cur->rc);//右子树入队}}
}
int main()
{Tree tree = NULL;build_tree(tree);// pre_print(tree);level_print(tree);return 0;
}

代码运行结果