```{index} single: frexp; POSIX function ``` ```{index} single: POSIX::frexp; Perl function ``` # frexp Split a floating-point number into mantissa and exponent. ## Synopsis ```perl my ($frac, $exp) = POSIX::frexp($x); ## $x == $frac * 2**$exp, with 0.5 <= |$frac| < 1 (or $frac == 0). ``` ## What you get back A two-element list: the fractional part as a double and the exponent as an integer. ## Differences from upstream Fully compatible with upstream POSIX. ## See also - `ldexp` — the inverse operation: reassemble `$x` from `$frac` and `$exp`. - `modf` — split into integer and fractional parts instead.