diff options
Diffstat (limited to 'manual/=limits.texinfo')
| -rw-r--r-- | manual/=limits.texinfo | 106 |
1 files changed, 53 insertions, 53 deletions
diff --git a/manual/=limits.texinfo b/manual/=limits.texinfo index 3e384dd6b6..7b55d70465 100644 --- a/manual/=limits.texinfo +++ b/manual/=limits.texinfo @@ -12,7 +12,7 @@ floating-point types supported by the GNU C library. * Floating-Point Limits :: Parameters which characterize supported floating-point representations on a particular - system. + system. @end menu @node Integer Representation Limits, Floating-Point Limits , , Representation Limits @@ -37,32 +37,32 @@ macros are all integer constant expressions. @pindex limits.h @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int CHAR_BIT This is the number of bits in a @code{char}, usually eight. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int SCHAR_MIN This is the minimum value that can be represented by a @code{signed char}. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int SCHAR_MAX This is the maximum value that can be represented by a @code{signed char}. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int UCHAR_MAX This is the maximum value that can be represented by a @code{unsigned char}. (The minimum value of an @code{unsigned char} is zero.) @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int CHAR_MIN This is the minimum value that can be represented by a @code{char}. It's equal to @code{SCHAR_MIN} if @code{char} is signed, or zero @@ -70,7 +70,7 @@ otherwise. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int CHAR_MAX This is the maximum value that can be represented by a @code{char}. It's equal to @code{SCHAR_MAX} if @code{char} is signed, or @@ -78,7 +78,7 @@ It's equal to @code{SCHAR_MAX} if @code{char} is signed, or @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int SHRT_MIN This is the minimum value that can be represented by a @code{signed short int}. On most machines that the GNU C library runs on, @@ -86,21 +86,21 @@ short int}. On most machines that the GNU C library runs on, @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int SHRT_MAX This is the maximum value that can be represented by a @code{signed short int}. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int USHRT_MAX This is the maximum value that can be represented by an @code{unsigned short int}. (The minimum value of an @code{unsigned short int} is zero.) @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int INT_MIN This is the minimum value that can be represented by a @code{signed int}. On most machines that the GNU C system runs on, an @code{int} is @@ -108,21 +108,21 @@ a 32-bit quantity. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro int INT_MAX This is the maximum value that can be represented by a @code{signed int}. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro {unsigned int} UINT_MAX This is the maximum value that can be represented by an @code{unsigned int}. (The minimum value of an @code{unsigned int} is zero.) @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro {long int} LONG_MIN This is the minimum value that can be represented by a @code{signed long int}. On most machines that the GNU C system runs on, @code{long} @@ -130,14 +130,14 @@ integers are 32-bit quantities, the same size as @code{int}. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro {long int} LONG_MAX This is the maximum value that can be represented by a @code{signed long int}. @end deftypevr @comment limits.h -@comment ANSI +@comment ISO @deftypevr Macro {unsigned long int} ULONG_MAX This is the maximum value that can be represented by an @code{unsigned long int}. (The minimum value of an @code{unsigned long int} is zero.) @@ -180,9 +180,9 @@ particular system. @menu * Floating-Point Representation:: Definitions of terminology. * Floating-Point Parameters:: Descriptions of the library - facilities. + facilities. * IEEE Floating Point:: An example of a common - representation. + representation. @end menu @node Floating-Point Representation, Floating-Point Parameters, , Floating-Point Limits @@ -233,7 +233,7 @@ unsigned integer. @cindex mantissa (of floating-point number) @cindex significand (of floating-point number) -@item +@item The @dfn{precision} of the mantissa. If the base of the representation is @var{b}, then the precision is the number of base-@var{b} digits in the mantissa. This is a constant for the particular representation. @@ -286,14 +286,14 @@ expression. The other macros listed here cannot be reliably used in places that require constant expressions, such as @samp{#if} preprocessing directives or array size specifications. -Although the ANSI C standard specifies minimum and maximum values for +Although the @w{ISO C} standard specifies minimum and maximum values for most of these parameters, the GNU C implementation uses whatever floating-point representations are supported by the underlying hardware. -So whether GNU C actually satisfies the ANSI C requirements depends on +So whether GNU C actually satisfies the @w{ISO C} requirements depends on what machine it is running on. @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_ROUNDS This value characterizes the rounding mode for floating-point addition. The following values indicate standard rounding modes: @@ -317,7 +317,7 @@ mode. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_RADIX This is the value of the base, or radix, of exponent representation. This is guaranteed to be a constant expression, unlike the other macros @@ -325,28 +325,28 @@ described in this section. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_MANT_DIG This is the number of base-@code{FLT_RADIX} digits in the floating-point mantissa for the @code{float} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int DBL_MANT_DIG This is the number of base-@code{FLT_RADIX} digits in the floating-point mantissa for the @code{double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int LDBL_MANT_DIG This is the number of base-@code{FLT_RADIX} digits in the floating-point mantissa for the @code{long double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_DIG This is the number of decimal digits of precision for the @code{float} data type. Technically, if @var{p} and @var{b} are the precision and @@ -360,14 +360,14 @@ The value of this macro is guaranteed to be at least @code{6}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int DBL_DIG This is similar to @code{FLT_DIG}, but is for the @code{double} data type. The value of this macro is guaranteed to be at least @code{10}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int LDBL_DIG This is similar to @code{FLT_DIG}, but is for the @code{long double} data type. The value of this macro is guaranteed to be at least @@ -375,7 +375,7 @@ data type. The value of this macro is guaranteed to be at least @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_MIN_EXP This is the minimum negative integer such that the mathematical value @code{FLT_RADIX} raised to this power minus 1 can be represented as a @@ -385,21 +385,21 @@ represented in the exponent field of the number. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int DBL_MIN_EXP This is similar to @code{FLT_MIN_EXP}, but is for the @code{double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int LDBL_MIN_EXP This is similar to @code{FLT_MIN_EXP}, but is for the @code{long double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_MIN_10_EXP This is the minimum negative integer such that the mathematical value @code{10} raised to this power minus 1 can be represented as a @@ -408,14 +408,14 @@ guaranteed to be no greater than @code{-37}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int DBL_MIN_10_EXP This is similar to @code{FLT_MIN_10_EXP}, but is for the @code{double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int LDBL_MIN_10_EXP This is similar to @code{FLT_MIN_10_EXP}, but is for the @code{long double} data type. @@ -424,7 +424,7 @@ double} data type. @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_MAX_EXP This is the maximum negative integer such that the mathematical value @code{FLT_RADIX} raised to this power minus 1 can be represented as a @@ -434,21 +434,21 @@ in the exponent field of the number. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int DBL_MAX_EXP This is similar to @code{FLT_MAX_EXP}, but is for the @code{double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int LDBL_MAX_EXP This is similar to @code{FLT_MAX_EXP}, but is for the @code{long double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int FLT_MAX_10_EXP This is the maximum negative integer such that the mathematical value @code{10} raised to this power minus 1 can be represented as a @@ -457,14 +457,14 @@ guaranteed to be at least @code{37}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int DBL_MAX_10_EXP This is similar to @code{FLT_MAX_10_EXP}, but is for the @code{double} data type. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro int LDBL_MAX_10_EXP This is similar to @code{FLT_MAX_10_EXP}, but is for the @code{long double} data type. @@ -472,7 +472,7 @@ double} data type. @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro double FLT_MAX The value of this macro is the maximum representable floating-point number of type @code{float}, and is guaranteed to be at least @@ -480,7 +480,7 @@ number of type @code{float}, and is guaranteed to be at least @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro double DBL_MAX The value of this macro is the maximum representable floating-point number of type @code{double}, and is guaranteed to be at least @@ -488,7 +488,7 @@ number of type @code{double}, and is guaranteed to be at least @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro {long double} LDBL_MAX The value of this macro is the maximum representable floating-point number of type @code{long double}, and is guaranteed to be at least @@ -497,7 +497,7 @@ number of type @code{long double}, and is guaranteed to be at least @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro double FLT_MIN The value of this macro is the minimum normalized positive floating-point number that is representable by type @code{float}, and is @@ -505,7 +505,7 @@ guaranteed to be no more than @code{1E-37}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro double DBL_MIN The value of this macro is the minimum normalized positive floating-point number that is representable by type @code{double}, and @@ -513,7 +513,7 @@ is guaranteed to be no more than @code{1E-37}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro {long double} LDBL_MIN The value of this macro is the minimum normalized positive floating-point number that is representable by type @code{long double}, @@ -522,7 +522,7 @@ and is guaranteed to be no more than @code{1E-37}. @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro double FLT_EPSILON This is the minimum positive floating-point number of type @code{float} such that @code{1.0 + FLT_EPSILON != 1.0} is true. It's guaranteed to @@ -530,14 +530,14 @@ be no greater than @code{1E-5}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro double DBL_EPSILON This is similar to @code{FLT_EPSILON}, but is for the @code{double} type. The maximum value is @code{1E-9}. @end deftypevr @comment float.h -@comment ANSI +@comment ISO @deftypevr Macro {long double} LDBL_EPSILON This is similar to @code{FLT_EPSILON}, but is for the @code{long double} type. The maximum value is @code{1E-9}. @@ -546,15 +546,15 @@ type. The maximum value is @code{1E-9}. @node IEEE Floating Point, , Floating-Point Parameters, Floating-Point Limits @subsection IEEE Floating Point -@cindex IEEE floating-point representation +@cindex IEEE floating-point representation @cindex floating-point, IEEE @cindex IEEE Std 754 Here is an example showing how these parameters work for a common floating point representation, specified by the @cite{IEEE Standard for -Binary Floating-Point Arithmetic (ANSI/IEEE Std 754-1985)}. Nearly -all computers today use this format. +Binary Floating-Point Arithmetic (ANSI/IEEE Std 754-1985 or ANSI/IEEE +Std 854-1987)}. Nearly all computers today use this format. The IEEE single-precision float representation uses a base of 2. There is a sign bit, a mantissa with 23 bits plus one hidden bit (so the total |