二叉树递归遍历

灰太狼 2022-04-10 09:23 199阅读 0赞

## 二叉树遍历 ##

![在这里插入图片描述][Image 1]

![20190101173727566.png][]

1.  先序遍历：根左右  
    结果：ABCDEFGH  
      
    
2.  中序遍历：左根右  
    结果：BDCEAFHG  
      
    
3.  后续遍历：左右根  
    结果：DECBHGFA

--------------------

## 代码 ##

#include <stdio.h>
    #include <string.h>
    
    
    
    typedef struct BINARYNODE
    { 
    	char ch;
    	struct BINARYNODE* left;
    	struct BINARYNODE* right;
    
    }BinaryNode;
    
    
    
    
    void Recursion(BinaryNode* root)
    { 
    	if(root==NULL) return;
    
    //先序 
    　　printf("%c",root->ch);
    	Recursion(root->left);
    	Recursion(root->right);
    	
    //中序　　
    // Recursion(root->left);
    // printf("%c",root->ch);
    // Recursion(root->right);
    
    //后序　　
    // Recursion(root->left);
    // Recursion(root->right);
    // printf("%c",root->ch);
    
    }
    
    
    int main(void)
    { 
        BinaryNode b1,b2,b3,b4,b5,b6,b7,b8;
    
    	b1.ch = 'A'; b1.left = &b2; b1.right = &b3;
    	b2.ch = 'B'; b2.left = NULL;b2.right = &b4;
    	b3.ch = 'F'; b3.left = NULL;b3.right = &b5;
    	b4.ch = 'C'; b4.left = &b6; b4.right = &b7;
    	b5.ch = 'G'; b5.left = &b8; b5.right = NULL;
    	b6.ch = 'D'; b6.left = NULL; b6.right = NULL;
    	b7.ch = 'E'; b7.left = NULL; b7.right = NULL;
    	b8.ch = 'H'; b8.left = NULL; b8.right = NULL;
    
    	Recursion(&b1);
    
    
    	return 0;
    }

结果：  
先序  
![在这里插入图片描述][20190101174555685.png]  
中序  
![在这里插入图片描述][20190101174631245.png]  
后序  
![在这里插入图片描述][20190101174654222.png]

[Image 1]: 
[20190101173727566.png]: /images/20220401/8fca626e58ea440193c1f27d4a79dc3f.png
[20190101174555685.png]: /images/20220401/125696163e0347e2be074d2a4fb4eb8d.png
[20190101174631245.png]: /images/20220401/c145dde323db47609571a3f1f1f4751d.png
[20190101174654222.png]: /images/20220401/4541fed4a1f24c86a582f0abe85a3c3f.png