Question: The following program is to check if the math expression is valid. Why doesn't the following code work properly? Explain the reason(s) using example statement(s)

The following program is to check if the math expression is valid. Why doesn't the following code work properly? Explain the reason(s) using example statement(s) and how to solve the issue(s). Printing error messages is irrelevant to this question. FYI, there are three issues in the program

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