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4. Write a C++ program to input a postfix string which is saved in a data file, named data.txt, and evaluate the postfix string. Output

4. Write a C++ program to input a postfix string which is saved in a data file, named "data.txt", and evaluate the postfix string. Output the result of it. (30 points) 5. Write a C++ program to implement a quick sort. (30 points)

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