NAME

decimal_to_floating: decimal_to_single, decimal_to_double, decimal_to_extended - convert decimal record to floatingpoint value

SYNOPSIS

cc [ flag... ] file ...  -lucb

#include <floatingpoint.h>
void decimal_to_single(px, pm, pd, ps)
single *px ;
decimal_mode *pm;
decimal_record *pd;
fp_exception_field_type *ps;
void decimal_to_double(px, pm, pd, ps)
double *px ;
decimal_mode *pm;
decimal_record *pd;
fp_exception_field_type *ps;
void decimal_to_extended(px, pm, pd, ps)
extended *px ;
decimal_mode *pm;
decimal_record *pd;
fp_exception_field_type *ps;

DESCRIPTION

The decimal_to_floating 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 DECIMAL_STRING_LENGTH-1 significant digits because one character is used to terminate the string with a NULL. If pd->more!=0 on input then additional nonzero digits follow those in pd->ds; fp_inexact is set accordingly 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. pd->ndigits, pm->df, and pm->ndigits are not used. strtod(3C), scanf(3S), fscanf(), and sscanf() all use decimal_to_double.

SEE ALSO

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