This assignment is to help you understand the stack data structure, its implementations and applications. You also will learn how to use Polish Notations for expressions and their calculations.

You are to design a simple GUI calculator using the stack data structure to perform additions, subtractions, multiplications and divisions. The calculator window should have at least two panels - one for display and the other for buttons (0 - 9, . , +, -, X, /, =, C). After an expression is entered, its postfix or prefix is displayed and then the result.

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