ldexp(3c) — DG/UX 4.30



     frexp(3c)                  DG/UX 4.30                   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 non-zero 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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