Two bug fixes: hex input val, signed function fix
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In the text file mode, it accepts a text file that contains hexadecimal values (instead of integers). I made this change because it would be confusing to ask users to convert their floating point values into fixed-point then into integers and then into unsigned integers. Now, they can provide hexadecimal values (refer to example.txt in the attached file).
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In the function mode, it implements signed functions without changing the original equation. The tool prints out the input and output format as well.