DECIMAL_TO_FLOATING(3C) Standard C Library Functions
NAME
decimal_to_floating, decimal_to_single, decimal_to_double,
decimal_to_extended, decimal_to_quadruple - convert decimal record to
floating-point value
SYNOPSIS
#include <floatingpoint.h>
void decimal_to_single(
single *px,
decimal_mode *pm,
decimal_record *pd,
fp_exception_field_type *ps);
void decimal_to_double(
double *px,
decimal_mode *pm,
decimal_record *pd,
fp_exception_field_type *ps);
void decimal_to_extended(
extended *px,
decimal_mode *pm,
decimal_record *pd,
fp_exception_field_type *ps);
void decimal_to_quadruple(
quadruple *px,
decimal_mode *pm,
decimal_record *pd,
fp_exception_field_type *ps);
DESCRIPTION
These functions convert the decimal record *
pd to a floating-point
value *
px observing the rounding direction specified in *
pm and
setting *
ps to reflect any floating-point exceptions that occur.
When
pd->
fpclass is
fp_zero,
fp_infinity,
fp_quiet, or
fp_signaling,
*
px is set to zero, infinity, a quiet NaN, or a signaling NaN,
respectively, with the sign indicated by
pd->
sign. All other fields
in *
pd are ignored.
When
pd->
fpclass is
fp_normal or
fp_subnormal,
pd->
ds must contain a
null-terminated string of one or more ASCII digits representing a
non-zero integer
m, and
pd->
ndigits must be equal to the length of
this string. Then *
px is set to a correctly rounded approximation to
-1**(pd->sign) * m * 10**(pd->exponent)
pd->
more can be set to a non-zero value to indicate that
insignificant trailing digits were omitted from
pd->
ds. In this case,
m is replaced by
m +
delta in the expression above, where
delta is
some tiny positive fraction.
The converted value is rounded according to the rounding direction
specified in
pm->
rd.
pm->
df and
pm->
ndigits are not used.
On exit, *
ps contains a bitwise OR of flags corresponding to any
floating-point exceptions that occurred. The only possible exceptions
are underflow, overflow, and inexact. If no floating-point
exceptions occurred, *
ps is set to zero.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | MT-Safe |
+---------------+-----------------+
SEE ALSO
scanf(3C),
string_to_decimal(3C),
strtod(3C),
attributes(7) October 1, 2001 DECIMAL_TO_FLOATING(3C)
