double pi = 0;for (int i = 1; i <= 99999999; i++) { if (i % 2 == 0) { if (((i + 2) / 2) % 2 == 0) { pi = pi - 1.00 / (i + 1); } else { pi = pi + 1.00 / (i + 1); } }}pi = (1+pi)*4;System.out.println(pi);
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