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| -rw-r--r-- | doc/info/chap/integer-types.texinfo | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/doc/info/chap/integer-types.texinfo b/doc/info/chap/integer-types.texinfo index 2d9e1de..0684d0b 100644 --- a/doc/info/chap/integer-types.texinfo +++ b/doc/info/chap/integer-types.texinfo @@ -1,12 +1,26 @@ @node Integer types @chapter Integer types + +@menu +* Builtin integer types:: Integer types provided by the compiler. +@end menu + + + +@node Builtin integer types +@section Builtin integer types + @cpindex Integer types @cpindex Types, integer +@hfindex limits.h The C programming languages, provides several integer types. All of these have limited portability, and are intrinsic (they are provided by the compiler, not the standard library.) +All constants named in this section of are +made available by including the header file +@file{<limits.h>}. @table @code @item char @@ -17,7 +31,8 @@ It is either signed or unsigned, depending on the implementation. It contains @code{CHAR_BIT} bits. @sc{POSIX} requires that @code{CHAR_BIT == 8}, however the C standard only specifies that -@code{CHAR_BIT >= 8}. +@code{CHAR_BIT >= 8}. The range of this type +is [@code{CHAR_MIN}, @code{CHAR_MAX}]. @item signed char @tpindex signed char @@ -29,19 +44,30 @@ to have a range of either or [@math{-2}@sup{@code{CHAR_BIT}@math{~-~1}}, @math{2}@sup{@code{CHAR_BIT}@math{~-~1}}@math{~-~1}]. +The exact range is [@code{SCHAR_MIN}, @code{SCHAR_MAX}]. @end iftex @ifnottex Signed version of @code{char}. It is guaranteed to have a range of at least either [-2^(@code{CHAR_BIT} - 1) + 1, 2^(@code{CHAR_BIT} - 1) - 1] or [-2^(@code{CHAR_BIT} - 1), 2^(@code{CHAR_BIT} - 1) - 1]. +The exact range is [@code{SCHAR_MIN}, @code{SCHAR_MAX}]. @end ifnottex @item unsigned char @tpindex unsigned char +@iftex Unsigned version of @code{char}. It is guaranteed to have a range of exactly -[0, @math{2}@sup{@code{CHAR_BIT}}@math{~-~1}]. +[0, @math{2}@sup{@code{CHAR_BIT}}@math{~-~1}], +or equivalently [0, @code{UCHAR_MAX}]. +@end iftex +@ifnottex +Unsigned version of @code{char}. It is guaranteed +to have a range of exactly +[0, 2^@code{CHAR_BIT} -1], +or equivalently [0, @code{UCHAR_MAX}]. +@end ifnottex @item short int @itemx short @@ -51,12 +77,14 @@ to have a range of exactly @tpindex signed short int Signed integer type of at least 16 bits. Its range is guaranteed contain at least [@math{-32767}, @math{32767}]. +The exact range [@code{SHORT_MIN}, @code{SHORT_MAX}]. @itemx unsigned short int @itemx unsigned short @tpindex unsigned short int Unsigned integer type of at least 16 bits. Its range is guaranteed contain at least [0, @math{65535}]. +The exact range [0, @code{USHORT_MAX}]. @item signed int @itemx int @@ -64,11 +92,13 @@ guaranteed contain at least [0, @math{65535}]. @tpindex signed int Signed integer type of at least 16 bits. Its range is guaranteed contain at least [@math{-32767}, @math{32767}]. +The exact range [@code{INT_MIN}, @code{INT_MAX}]. @item unsigned int @tpindex unsigned int Unsigned integer type of at least 16 bits. Its range is guaranteed contain at least [0, @math{65535}]. +The exact range [0, @code{UINT_MAX}]. @item signed @tpindex signed @@ -93,13 +123,15 @@ outside that range [[0, @math{65535}]] should not be used. @tpindex long int Signed integer type of at least 32 bits. Its range is guaranteed contain at least [@math{-2147483647}, -@math{2147483647}]. +@math{2147483647}]. The exact range [@code{LONG_MIN}, +@code{LONG_MAX}]. @item unsigned long int @itemx unsigned long @tpindex unsigned long int Unsigned integer type of at least 32 bits. Its range is guaranteed contain at least [0, @math{4294967295}]. +The exact range [0, @code{ULONG_MAX}]. @item long long int @itemx long long @@ -110,12 +142,14 @@ guaranteed contain at least [0, @math{4294967295}]. Signed integer type of at least 64 bits. Its range is guaranteed contain at least [@math{-9223372036854775807}, @math{9223372036854775807}]. This type was added in C99. +The exact range [@code{LLONG_MIN}, @code{LLONG_MAX}]. @item unsigned long long int @itemx unsigned long long @tpindex unsigned long long int Unsigned integer type of at least 64 bits. Its range is guaranteed contain at least [0, @math{18446744073709551615}]. -This type was added in C99. +This type was added in C99. The exact range [0, +@code{ULLONG_MAX}]. @end table |