diff options
Diffstat (limited to 'manual/arith.texi')
| -rw-r--r-- | manual/arith.texi | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/manual/arith.texi b/manual/arith.texi index 5080abf063..6ca7902b3d 100644 --- a/manual/arith.texi +++ b/manual/arith.texi @@ -875,20 +875,20 @@ complete response as @dfn{signalling} a domain error, overflow, or underflow. When a math function suffers a domain error, it raises the invalid -exception and returns NaN. It also sets @var{errno} to @code{EDOM}; +exception and returns NaN. It also sets @code{errno} to @code{EDOM}; this is for compatibility with old systems that do not support @w{IEEE 754} exception handling. Likewise, when overflow occurs, math functions raise the overflow exception and, in the default rounding mode, return @math{@infinity{}} or @math{-@infinity{}} as appropriate (in other rounding modes, the largest finite value of the appropriate sign is returned when appropriate for that rounding mode). They also -set @var{errno} to @code{ERANGE} if returning @math{@infinity{}} or -@math{-@infinity{}}; @var{errno} may or may not be set to +set @code{errno} to @code{ERANGE} if returning @math{@infinity{}} or +@math{-@infinity{}}; @code{errno} may or may not be set to @code{ERANGE} when a finite value is returned on overflow. When underflow occurs, the underflow exception is raised, and zero (appropriately signed) or a subnormal value, as appropriate for the mathematical result of the function and the rounding mode, is -returned. @var{errno} may be set to @code{ERANGE}, but this is not +returned. @code{errno} may be set to @code{ERANGE}, but this is not guaranteed; it is intended that @theglibc{} should set it when the underflow is to an appropriately signed zero, but not necessarily for other underflows. @@ -2545,7 +2545,7 @@ You should not check for errors by examining the return value of @code{0l}, @code{LONG_MAX}, or @code{LONG_MIN}. Instead, check whether @var{tailptr} points to what you expect after the number (e.g. @code{'\0'} if the string should end after the number). You also -need to clear @var{errno} before the call and check it afterward, in +need to clear @code{errno} before the call and check it afterward, in case there was overflow. There is an example at the end of this section. @@ -2574,7 +2574,7 @@ for example that @code{strtoul} on @code{"-1"} returns @code{ULONG_MAX} and an input more negative than @code{LONG_MIN} returns (@code{ULONG_MAX} + 1) / 2. -@code{strtoul} sets @var{errno} to @code{EINVAL} if @var{base} is out of +@code{strtoul} sets @code{errno} to @code{EINVAL} if @var{base} is out of range, or @code{ERANGE} on overflow. @end deftypefun @@ -2892,7 +2892,7 @@ representation of NaN (there can be several). Since zero is a valid result as well as the value returned on error, you should check for errors in the same way as for @code{strtol}, by -examining @var{errno} and @var{tailptr}. +examining @code{errno} and @var{tailptr}. @end deftypefun @deftypefun float strtof (const char *@var{string}, char **@var{tailptr}) |