二叉树的定义————Java与C语言

java语言版二叉树的定义：

public class TreeNode {
    int val;
  	TreeNode left;
  	TreeNode right;
  	TreeNode() {}
  	TreeNode(int val) { this.val = val; }
  	TreeNode(int val, TreeNode left, TreeNode right) {
    		this.val = val;
    		this.left = left;
    		this.right = right;
  	}
}

C语言版二叉树的定义：

typedef char BTDataType;
typedef struct BinaryTreeNode
{
	struct BinaryTreeNode* left;
	struct BinaryTreeNode* right;
	BTDataType data;
}BTNode;