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fegetprec(3m) [opensolaris man page]

fesetprec(3M)						  Mathematical Library Functions					     fesetprec(3M)

NAME
fesetprec, fegetprec - control floating point rounding precision modes SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <fenv.h> int fesetprec(int prec); int fegetprec(void); DESCRIPTION
The IEEE 754 standard defines rounding precision modes for systems that always deliver intermediate results to destinations in extended double precision format. These modes allow such systems to deliver correctly rounded single and double precision results (in the absence of underflow and overflow) with only one rounding. The fesetprec() function sets the current rounding precision to the precision specified by prec, which must be one of the following values defined in <fenv.h>: FE_FLTPREC round to single precision FE_DBLPREC round to double precision FE_LDBLPREC round to extended double precision The default rounding precision when a program starts is FE_LDBLPREC. The fegetprec() function returns the current rounding precision. RETURN VALUES
The fesetprec() function returns a non-zero value if the requested rounding precision is established and 0 otherwise. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------------------------------------+ |ATTRIBUTE TYPE ATTRIBUTE VALUE | |Architecture Intel (see below) | |Availability SUNWlibms | |Interface Stability Stable | |MT-Level MT-Safe | +-----------------------------------------------------------+ These functions are not available on SPARC systems because SPARC processors deliver intermediate results to destinations in single or dou- ble format as determined by each floating point instruction. SEE ALSO
fegetenv(3M), fesetround(3M), attributes(5) Numerical Computation Guide SunOS 5.11 12 Jul 2006 fesetprec(3M)

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fegetround(3M)						  Mathematical Library Functions					    fegetround(3M)

NAME
fegetround, fesetround - get and set current rounding direction SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <fenv.h> int fegetround(void); int fesetround(int round); DESCRIPTION
The fegetround function gets the current rounding direction. The fesetround function establishes the rounding direction represented by its argument round. If the argument is not equal to the value of a rounding direction macro, the rounding direction is not changed. RETURN VALUES
The fegetround function returns the value of the rounding direction macro representing the current rounding direction, or a negative value if there is no such rounding direction macro or the current rounding direction is not determinable. The fesetround function returns a 0 value if and only if the requested rounding direction was established. ERRORS
No errors are defined. EXAMPLES
The following example saves, sets, and restores the rounding direction, reporting an error and aborting if setting the rounding direction fails: Example 1 Save, set, and restore the rounding direction. #include <fenv.h> #include <assert.h> void f(int round_dir) { #pragma STDC FENV_ACCESS ON int save_round; int setround_ok; save_round = fegetround(); setround_ok = fesetround(round_dir); assert(setround_ok == 0); /* ... */ fesetround(save_round); /* ... */ } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
fenv.h(3HEAD), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 fegetround(3M)
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