Initial project import

tools/v/examples/pidigits.v

@@ -0,0 +1,26 @@
+import math.big
+
+// pi_digits calculates the digits of Pi, based on https://mail.python.org/pipermail/edu-sig/2012-December/010721.html
+fn pi_digits(count int) {
+	mut n := count
+	mut k, mut a, mut b, mut a1, mut b1 := big.c2, big.c4, big.c1, big.c12, big.c4
+	mut p, mut q := k, k
+	for n > 0 {
+		p, q, k = k * k, (big.c2 * k) + big.c1, k + big.c1
+		a, b, a1, b1 = a1, b1, p * a + q * a1, p * b + q * b1
+		mut d := a / b
+		mut d1 := a1 / b1
+		for d == d1 {
+			print(d.int())
+			n--
+			a, a1 = big.c10 * (a % b), big.c10 * (a1 % b1)
+			d, d1 = a / b, a1 / b1
+			if n <= 0 {
+				break
+			}
+		}
+	}
+}
+
+pi_digits(arguments()[1] or { '100' }.int())
+println('')