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2020-01-19 release

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bellard
2020-09-06 18:57:11 +02:00
parent 91459fb672
commit 0e8fffd4de
26 changed files with 4298 additions and 3639 deletions
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18
examples/pi_bigdecimal.js
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@@ -6,10 +6,10 @@
/* compute PI with a precision of 'prec' digits */
function calc_pi(prec) {
const CHUD_A = 13591409d;
const CHUD_B = 545140134d;
const CHUD_C = 640320d;
const CHUD_C3 = 10939058860032000d; /* C^3/24 */
const CHUD_A = 13591409m;
const CHUD_B = 545140134m;
const CHUD_C = 640320m;
const CHUD_C3 = 10939058860032000m; /* C^3/24 */
const CHUD_DIGITS_PER_TERM = 14.18164746272548; /* log10(C/12)*3 */
/* return [P, Q, G] */
@@ -17,7 +17,7 @@ function calc_pi(prec) {
var c, P, Q, G, P1, Q1, G1, P2, Q2, G2, b1;
if (a == (b - 1n)) {
b1 = BigDecimal(b);
G = (2d * b1 - 1d) * (6d * b1 - 1d) * (6d * b1 - 5d);
G = (2m * b1 - 1m) * (6m * b1 - 1m) * (6m * b1 - 5m);
P = G * (CHUD_B * b1 + CHUD_A);
if (b & 1n)
P = -P;
@@ -32,7 +32,7 @@ function calc_pi(prec) {
if (need_G)
G = G1 * G2;
else
G = 0d;
G = 0m;
}
return [P, Q, G];
}
@@ -44,7 +44,7 @@ function calc_pi(prec) {
Q = BigDecimal.div(Q, (P + Q * CHUD_A),
{ roundingMode: "half-even",
maximumSignificantDigits: prec });
G = (CHUD_C / 12d) * BigDecimal.sqrt(CHUD_C,
G = (CHUD_C / 12m) * BigDecimal.sqrt(CHUD_C,
{ roundingMode: "half-even",
maximumSignificantDigits: prec });
return Q * G;
@@ -64,7 +64,5 @@ function calc_pi(prec) {
/* we add more digits to reduce the probability of bad rounding for
the last digits */
r = calc_pi(n_digits + 20);
r = BigDecimal.round(r, { roundingMode: "down",
maximumFractionDigits: n_digits })
print(r);
print(r.toFixed(n_digits, "down"));
})();