pi-compute 3.14.15

to compute N digits of pi

this is toy tool to compute the N digits of pi

usage

python usage

• python3 setup build
• python3 pi.py 1000

cpp usage

• make pi_thread for two threads
• make pi_v2 for single thread

implementations

• pi.d:this is the original d language implementations of pi
• pi.cpp: motivated by pi.d and use two threads to build the dynamic shared library
• test/pi_v2.cpp is single thread
• test/pi_thread.cpp is two threads

reference:

• https://github.com/dlang/dmd/blob/master/samples/pi.d

• https://en.wikipedia.org/wiki/Pi

• v1: $$\arctan(\frac{1}{2}) +\arctan(\frac{1}{3}) =\frac{\pi}{4}$$

• v2: $$4\arctan(\frac{1}{5}) - \arctan(\frac{1}{239}) =\frac{\pi}{4}$$