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UNIX

Running the prefixer
Change your current directory to the directory containing the prefixer output file.
The command "./prefixer" will run the output file.
The file infixExpression.txt was included, but any file containing an expression can be used, as per the requirements.
As per the requirements, using the "-r" flag will output a simplified version of the expression in the input file.

Note
If you don't want to type "./" before the prefixer command to run the prefixer, you can copy the output to your bin folder so that you can just execute the command "prefixer".
Use the following command:
sudo cp ~/prefixer /usr/bin
You will most likely be prompted for a password, so hopefully you have the correct privileges to perform this action.

Note for simplification of integers
If division of the number results in a number less than 1 (0 in integer division), it is not simplified.