Date: 11/13/07 (Java Web)    Keywords: java

Sample Java code to calculate PI to arbitrary precision. This uses Machin’s formula: pi/4 = 4*arctan(1/5) - arctan(1/239). Notes: 1. Run Pi with a positive integer precision value. For example to calculate PI to 10 decimal places run: java Pi 10 2. There are other algorithms and even better ones to calculate PI too. This is just an example. [...]

Source: http://blog.taragana.com/index.php/archive/calculate-pi-to-arbitrary-precision-sample-java-code/