Math::BigFloat (Perl in a Nutshell, 2nd Edition)

8.142. Math::BigFloat

Provides methods that permit use of floating-point numbers of arbitrary length. The following apply to all methods, except as noted:

The object $f remains unchanged.
All methods except fcmp return a number string (nstr) of the form /[+-]\d+E[+-]\d+/, with embedded whitespace ignored.
A return value of NaN indicates that either an input parameter was "Not a Number" or that an illegal operation was attempted.
A similar default scale value is computed for square roots.

new

$f = Math::BigFloat->new(string)

Creates a new object, $f.

fabs

$f->fabs(  )

Returns absolute value of $f.

fadd

$f->fadd(nstr)

Returns sum of nstr and $f.

fcmp

$f->fcmp(nstr)

Compares $f to nstr. Returns -1, 0, or 1 depending on whether $f is less than, equal to, or greater than nstr, or undef if nstr is not a number.

fdiv

$f->fdiv(nstr[,n])

Returns $f divided by nstr to nplaces. If scale (the number of digits) is unspecified, division is computed to the number of digits given by:

max($div_scale, length(dividend)+length(divisor))

ffround

$f->ffround(n)

Returns $f rounded at nth place.

fmul

$f->fmul(nstr)

Returns $f multiplied by nstr.

fneg

$f->fneg(  )

Returns negative of $f.

fnorm

$f->fnorm(  )

Returns normalization of $f.

fround

$f->fround(n)

Returns value of $frounded to n digits.

fsqrt

$f->fsqrt([n])

Returns square root of $f to n places.

fsub

$f->fsub(nstr)

Returns $f minus nstr.