10-14-2012
Quote:
Originally Posted by
elixir_sinari
Only the printf builtin in ksh93t+ seems to give me what I expect (4.5 being rounded to 5 and 5.5 to 6).
Why so?
Because floating point doesn't work that way. It doesn't count in nice 1.0 jumps, and forcing it to do so removes a lot of the point of having a floating point -- both figuratively and literally.
It's not really a missing feature, anyway. Add 0.5 before you print the decimal and that gets you rounding.
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LEARN ABOUT OPENSOLARIS
decimal_to_floating
decimal_to_floating(3C) Standard C Library Functions decimal_to_floating(3C)
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, respec-
tively, 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(5) 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(5)
SunOS 5.11 1 Oct 2001 decimal_to_floating(3C)