本代码提供了二叉树前序、中序、后序遍历的三种遍历方法，实现了遍历的图形化演示，使用了初学者以及日常课程教学。-This code provides a pre-binary sequence, three traversal methods in sequence, after traversing achieve a traversal of the graphical presentation, using the beginner as well as the daily teaching

实现整数（包括负数）的四则运算，使用Qt制作的图形界面。算式正确输出结果并打印二叉树。算式错误输出提示-Integer (including negative) of the four operations, making use of Qt graphical interface. The correct formula output and print two fork tree. Formula error output prompt

tc实现的二叉树算法集，对理解二叉树的相关算法有一定的帮助-tc binary tree algorithm to achieve set of related algorithms for understanding the binary tree is certainly helpful