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instance method
BigDecimal#sqrt
sqrt(p1)
ext/bigdecimal/bigdecimal.c
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static VALUE
BigDecimal_sqrt(VALUE self, VALUE nFig)
{
ENTER(5);
Real *c, *a;
size_t mx, n;
GUARD_OBJ(a, GetVpValue(self, 1));
mx = a->Prec * (VpBaseFig() + 1);
n = GetPrecisionInt(nFig) + VpDblFig() + BASE_FIG;
if (mx <= n) mx = n;
GUARD_OBJ(c, VpCreateRbObject(mx, "0"));
VpSqrt(c, a);
return ToValue(c);
}
sqrt(n)
Returns the square root of the value.
Result has at least n significant digits.