From b3d63b8b73afd841dc0c484a40db590db2003dc5 Mon Sep 17 00:00:00 2001
From: xtaodada <xtao@xtaolink.cn>
Date: Wed, 27 Apr 2022 14:04:19 +0000
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20''?=
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---
 ex4_1.c | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 ex4_1.c

diff --git a/ex4_1.c b/ex4_1.c
new file mode 100644
index 0000000..55b4d9d
--- /dev/null
+++ b/ex4_1.c
@@ -0,0 +1,193 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<conio.h>
+#include<string.h>
+#define MAX 100
+int top = -1;
+typedef struct tnode {
+    int data;
+    struct tnode *lchild; 
+	struct tnode *rchild;
+}BTNode, *BTree;
+typedef struct Queue{
+	BTree data;
+	struct Queue* next;
+}Qnode;
+typedef struct point{
+	Qnode* front;//头指针
+	Qnode* rear;//尾指针
+}LinkQueue;
+BTree CreatBTree(){
+    int num;
+    BTree p;
+    scanf("%d", &num);
+    if (num == -1) {
+        p = NULL;
+    } else {
+        p = (BTree) malloc(sizeof(BTNode));
+        p->data = num;
+        printf("请输入 %d 的左子树:\n", num);
+        p->lchild = CreatBTree();
+        printf("请输入 %d 的右子树:\n", num);
+        p->rchild = CreatBTree();
+    }
+    return p;
+}
+void PreOrder(BTree tree){
+    if(tree == NULL){
+		return;
+	}
+	printf("%d", tree->data);
+    PreOrder(tree->lchild);
+    PreOrder(tree->rchild);
+}
+void InOrder(BTree tree){
+    if(tree == NULL){
+		return;
+	}
+    InOrder(tree->lchild);
+    printf("%d", tree->data);
+    InOrder(tree->rchild);
+}
+void LastOrder(BTree tree){
+    if(tree == NULL){
+		return;
+	}
+    LastOrder(tree->lchild);
+    LastOrder(tree->rchild);
+    printf("%d", tree->data);
+}
+void push(BTree a[],BTree node){
+    a[++top] = node;
+}
+void pop(){
+    if (top == -1) {
+        return;
+    }
+    top--;
+}
+BTree getTop(BTree a[]){
+    return a[top];
+}
+void InOrder2(BTree Tree){
+	top = -1;
+    BTree a[MAX],p;
+    push(a, Tree);
+    while (top != -1) {
+        while ((p = getTop(a)) && p != NULL){
+            push(a, p->lchild);
+        }
+        pop();
+        if (top != -1) {
+            p = getTop(a);
+            pop();
+            printf("%d", p->data);
+            push(a, p->rchild);
+        }
+    }
+}
+void InitQueue(LinkQueue* q){
+	q->front = q->rear = (Qnode*)malloc(sizeof(Qnode));
+	if (q->front == NULL)
+		return;
+}
+void EnQueue(LinkQueue* q, BTree ele){
+	Qnode* p = (Qnode*)malloc(sizeof(Qnode));
+	if (p == NULL) {
+		return;
+	}
+	if (ele == NULL)
+		return;
+	p->data = ele;
+	p->next = NULL;
+	q->rear->next = p;
+	q->rear = p;
+}
+int QueueEmpty(LinkQueue q)
+{
+	if (q.front != q.rear)
+		return 1;
+	else
+		return 0;
+}
+BTree DeQueue(LinkQueue* q)
+{
+	if (q->front == q->rear){
+		return;
+	}
+	Qnode* p = q->front->next;
+	BTree q_ = p->data;
+	q->front->next = p->next;
+	if (q->rear == p)
+		q->rear = q->front;
+	free(p);
+	return q_;
+}
+void LevelOrder(BTree Tree){
+	top = -1;
+    BTree p;
+    LinkQueue Q1;
+	InitQueue(&Q1);
+    EnQueue(&Q1, Tree);
+    while (QueueEmpty(Q1)) {
+    	p = DeQueue(&Q1);
+        printf("%d  ", p->data);
+        if (p->lchild != NULL) {
+		    EnQueue(&Q1, p->lchild);
+		}
+		if (p->rchild != NULL) {
+		    EnQueue(&Q1, p->rchild);
+		}
+    }
+}
+int main(){
+	int choice;
+	BTree tree;
+	
+	for(;;){
+		printf("\t\t1.递归先序建立二叉树\n");
+		printf("\t\t2.先序遍历二叉树\n");
+		printf("\t\t3.中序遍历二叉树\n");
+		printf("\t\t4.后序遍历二叉树\n");
+		printf("\t\t5.中序非递归遍历二叉树\n");
+		printf("\t\t6.层次遍历二叉树\n");
+		printf("\t\t0.退出\n");
+		
+		printf("请选择：");
+		scanf("%d",&choice);
+		if(choice==0) break;
+		switch (choice) {
+		case 1:
+			printf("开始先序创建二叉树，输入 -1 为空节点\n");
+			tree = CreatBTree();
+			break;
+		case 2:
+			PreOrder(tree);
+			printf("\n");
+			break;
+		case 3:
+			InOrder(tree);
+			printf("\n");
+			break;
+		case 4:
+			LastOrder(tree);
+			printf("\n");
+			break;
+		case 5:
+			InOrder2(tree);
+			printf("\n");
+			break;
+		case 6:
+			LevelOrder(tree);
+			printf("\n");
+			break;
+		default:
+			break;
+		}
+		printf("请按任意键继续...");
+		getch();
+		system("cls");
+	}
+    printf("感谢使用，再见\n");
+	return 0;
+}