Initial commit

Miscellaneous/pi.cpp

@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main(int argc, char const *argv[]) {
+	double eps;
+	double pi;
+	double sum = 0;
+	int sign = 1;
+
+	scanf("%lf", &eps);
+
+	for (int i = 0;; i++) {
+		double x = sign / (sqrt(3) * pow(3, i) * (2 * i + 1));
+		sum += sign / (sqrt(3) * pow(3, i) * (2 * i + 1));
+		sign = -sign;
+		if (1 / (sqrt(3) * pow(3, i) * (2 * i + 1)) < eps)
+			break;
+	}
+
+	pi = 6 * sum;
+
+	printf("pi=%f\n", pi);
+
+	return 0;
+}