Description: Topic: type of expression using the tree to achieve the prefix arithmetic expression conversion to normal expression, and the results calculated through the variable assignment. Test data: (1), respectively, enter 0 a-91+ A* bc+* 5 ~ x2* 8x+++* 3 ~ x3* 2 ~ x2x and output. (2) Whenever the importation of an expression after the assignment of these variables, and then expression is evaluated.
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