Computes an arbitrary number of digits of pi. Implementation details are inside copi.c.
make
./copi.exe <n digits of pi>
./copi.exe 100
Requested # digits of precision: 100
Actual # digits of precision: 156
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PI to 100 digits
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3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067