数据结构中堆栈的具体应用，实现表达式的化简、求值等功能，可以自由确定变量，并且可以给变量赋值。Vc开发，包括了用户操作界面，输入输出清晰。-stack data structures to the specific applications, simplification of the expression, evaluates functions and the freedom to determine variables, as well as to assign values to variables. Vc development, including the user interface, input and output clear.
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