文件名称:exp2
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（1）按逆波兰表达式建立树
(2) 输出表达式树的各种遍历的结果。
(3) 打印表达式树。
(4) 删除表达式树。
-(1) The establishment of trees by Reverse Polish Notation (2) output a variety of expression tree traversal results. (3) Print the expression tree. (4) Delete an expression tree.
(2) 输出表达式树的各种遍历的结果。
(3) 打印表达式树。
(4) 删除表达式树。
-(1) The establishment of trees by Reverse Polish Notation (2) output a variety of expression tree traversal results. (3) Print the expression tree. (4) Delete an expression tree.
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exp2.cpp