ldexp(3C) — sys5 — Apollo Domain/OS SR10.3.5

FREXP(3C)                            SysV                            FREXP(3C)



NAME
     frexp, ldexp, modf - manipulate parts of floating-point numbers

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

     double ldexp (value, exp)
     double value;
     int exp;

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

DESCRIPTION
     Every nonzero number can be written uniquely as x* 2n, 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 zero, both results returned by frexp are zero.

     ldexp returns the quantity value* 2exp.

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

DIAGNOSTICS
     If ldexp would cause overflow, +HUGE (defined in <math.h> ) is returned
     (according to the sign of value), and errno is set to ERANGE.
     If ldexp would cause underflow, zero is returned and errno is set to
     ERANGE.
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