decimal_to_floating(3
U)
NIX System V(BSD Compatibility Packad
ge)
cimal_to_floating(3)


NAME
      decimaltofloating:  decimaltosingle, decimaltodouble,
      decimaltoextended - convert decimal record to floating-point value

SYNOPSIS
      cc [ flag. . . ] file . . . -lucb
      #include <floatingpoint.h>

      void decimaltosingle(px, pm, pd, ps)
      single *px ;
      decimalmode *pm;
      decimalrecord *pd;
      fpexceptionfieldtype *ps;

      void decimaltodouble(px, pm, pd, ps)
      double *px ;
      decimalmode *pm;
      decimalrecord *pd;
      fpexceptionfieldtype *ps;

      void decimaltoextended(px, pm, pd, ps)
      extended *px ;
      decimalmode *pm;
      decimalrecord *pd;
      fpexceptionfieldtype *ps;

DESCRIPTION
      The decimaltofloating functions convert the decimal record at *pd into
      a floating-point value at *px, observing the modes specified in *pm and
      setting exceptions in *ps.  If there are no IEEE exceptions, *ps will be
      zero.

      pd->sign and pd->fpclass are always taken into account.  pd->exponent and
      pd->ds are used when pd->fpclass is fp_normal or fp_subnormal.  In these
      cases pd->ds must contain one or more ASCII digits followed by a NULL.
      *px is set to a correctly rounded approximation to

            (pd->sign)*(pd->ds)*10**(pd->exponent)

      Thus if pd->exponent == -2 and pd->ds == "1234", *px will get 12.34
      rounded to storage precision.  pd->ds cannot have more than
      DECIMALSTRINGLENGTH-1 significant digits because one character is used
      to terminate the string with a NULL.  If pd->more!=0 on input then addi-
      tional nonzero digits follow those in pd->ds; fp_inexact is set accord-
      ingly on output in *ps.

      *px is correctly rounded according to the IEEE rounding modes in pm->rd.
      *ps is set to contain fp_inexact, fp_underflow, or fp_overflow if any of
      these arise.





10/89                                                                    Page 1

decimal_to_floating(3
U)
NIX System V(BSD Compatibility Packad
ge)
cimal_to_floating(3)


      pd->ndigits, pm->df, and pm->ndigits are not used.

      strtod(3C), scanf(3S), fscanf(), and sscanf() all use decimaltodouble.

SEE ALSO
      scanf(3S), strtod(3C) in the Programmer's Reference Manual
















































Page 2                                                                    10/89