Create decimalchildwork.js

Author: barionleg

src/decimalchildwork.js

@@ -0,0 +1,42 @@
+import Decimal from "decimal.js"
+
+export function decimalchildwork(piwei, threadall, threadid) {
+  const precision = piwei
+  Decimal.set({ precision: precision })
+  var p = new Decimal(0)
+  var a = new Decimal(1)
+  var h = 1
+  var x = new Decimal(0)
+  var fu = 1
+  var t = new Decimal(1)
+  for (var i = 0, len = threadid; i < len; i++) {
+    fu = -1 * fu
+    a = Decimal.mul(a, 1024)
+    x = x.plus(1)
+  }
+  while (Decimal.abs(t).cmp(new Decimal("1e-" + precision)) >= 0) {
+    t = Decimal.mul(h, fu)
+
+      .mul(
+        Decimal.div(-(2 ** 5), Decimal.mul(4, x).plus(1))
+          .plus(Decimal.div(-1, Decimal.mul(4, x).plus(3)))
+          .plus(Decimal.div(2 ** 8, Decimal.mul(10, x).plus(1)))
+          .plus(Decimal.div(-(2 ** 6), Decimal.mul(10, x).plus(3)))
+          .plus(Decimal.div(-(2 ** 2), Decimal.mul(10, x).plus(5)))
+          .plus(Decimal.div(-(2 ** 2), Decimal.mul(10, x).plus(7)))
+          .plus(Decimal.div(1, Decimal.mul(10, x).plus(9)))
+      )
+      .div(Decimal.mul(2 ** 6, a))
+
+    p = Decimal.add(p, t)
+    if (Decimal.abs(t).cmp(new Decimal("1e-" + precision)) <= 0) break
+
+    for (var i = 0, len = threadall; i < len; i++) {
+      fu = -1 * fu
+      a = Decimal.mul(a, 1024)
+      x = x.plus(1)
+    }
+  }
+  x = x.plus(1)
+  return [String(p), String(x)]
+}