Construct the "double precision" (64-bit) floating point number d from the mantissa m, the exponent e and the sign flag s (true means the sign is negative).
New implementation

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Other implementations
  if (s) then
    d = -m * radix(d)**e
    d =  m * radix(d)**e
  end if

import "math"
if s {
	m = -m
d := math.Ldexp(m, e)
uses SysUtils;
d.buildup(s, m, e);
$d = ($s?-1:1) * "${m}e${e}"; 
import math
sign = -1 if s else 1
d = math.ldexp(sign*m,e)
d = (s ? -1 : 1) * Math::ldexp(m, e)