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844 ：NAS6 ◆n3AmnVhjwc []：2015/09/06(日) 05:25:54.12 ID:g2NsvO1D - バグがあると見るなら訂正
double calcPI(double r, double s, double n) {
double u = 1.0;
if (s == 1) u = 2.0;
if (n == 0) return u * ( r + (r * s / (2.0 * s + 1.0)));
return u * (r + calcPI(r * s / (2.0 * s + 1.0), s + 1, n - 1));
}
double calcPI3(double n) {
double r = 1.0;
double s = 1.0;
double t = 1.0;
double u = 1.0;
while (0 <= n) {
t = t * s / (2.0 * s + 1.0);
r = u * (r + t);
s += 1;
n -= 1;
}
u = 2.0;
return u * r;
}
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