To write a small program that calculated pi, pi using the method of Lai Buni second formula works to achieve, the current version can be calculated to five or more, and then note down the accumulated error count may be due, not precise enough to count, follow-up version will solve this problem.

pi_calc\main_form.dcu
.......\main_form.ddp
.......\main_form.dfm
.......\main_form.pas
.......\main_form.~ddp
.......\main_form.~dfm
.......\main_form.~pas
.......\pi_calc.cfg
.......\pi_calc.dof
.......\pi_calc.dpr
.......\pi_calc.exe
.......\pi_calc.res
pi_calc

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