Translations:User:Psychoslave//Lua reference manual translation stub/1591/en

Returns two values  and   such that:
 * If  is finite and non-zero: $$x = m \times 2^e$$,   is an integer, and the absolute value of   is in the range $$[0.5, 1)$$
 * If  is zero:   and   are 0
 * If  is NaN or infinite:   is   and   is not specified