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X-Bc basically takes input from keyboard or mouseclicks on buttons and
writes it into a file named ~/.xbc/xbc.input (the directory ~/.xbc/ will be created automatically while the configure-procedure runs). Then it executes
bash -c bc -lq settings.xbc extensions.bc ~/.xbc/xbc.input > ~/.xbc/xbc.output 2>
~/.xbc/xbc.error
As you can see, bc first executes settings.xbc, which sets parameters such as input and output bases and precision. Then it calls extensions.bc, which provides lots
of functionality about trigonometry, number-theory and exponential
functions. Then it reads the user input and writes the output and the
error to seperated files. These files are afterwards processed and
written onto the display.
Apart from extensions.bc the user can choose to execute as well
scientific_constants.bc, which provide several constants from physics,
astronomy and chemistry, and/or primenumbers.bc, which allows access to
an array called prime[] with the first 65535 primenumbers (2..821641).