public class Main { public static void main(String[] args) { double pi = 0; for (int i = 1;1/(double)i > 0.0000001;i = i + 2){ if ((i / 2 + 1) % 2 == 1) { pi += 4 /(double)i; } else { pi -= 4 /(double)i; } System.out.println(pi); } } }
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皮塔莫拉克