NAME
frexp, ldexp, modf - split into mantissa and exponent

SYNOPSIS
double frexp(value, eptr)
double value;
int *eptr;

double ldexp(value, exp)
double value;

double modf(value, iptr)
double value, *iptr;

DESCRIPTION
Every nonzero number can be written uniquely as x * 2^n, where the
"mantissa" (fraction) x is in the range 0.5 <= |x| < 1.0, and the
"exponent" n is an integer. Frexp returns the mantissa of a
double value, and stores the exponent indirectly in the location
pointed to by eptr. If value is 0, both results returned by frexp
are 0.

Ldexp returns the quantity value * 2^exp.

Modf returns the signed fractional part of value and stores the
integer part indirectly in the location pointed to by iptr.

SEE ALSO
ieee(3) for logb and scalb

DIAGNOSTICS
ldexp returns +-infinity on an overflow.