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Diffstat (limited to 'manual/lang.texi')
| -rw-r--r-- | manual/lang.texi | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/manual/lang.texi b/manual/lang.texi index 7f8a368..3705df0 100644 --- a/manual/lang.texi +++ b/manual/lang.texi @@ -653,6 +653,56 @@ sizeof (@var{type}) * CHAR_BIT @end smallexample @end table +That expression includes padding bits as well as value and sign bits. +On all systems supported by @theglibc{}, standard integer types other +than @code{_Bool} do not have any padding bits. TS 18661-1:2014 +defines additional macros for the width of integer types (the number +of value and sign bits); these macros can also be used in @code{#if} +preprocessor directives, whereas @code{sizeof} cannot. The following +macros are defined in @file{limits.h}. + +@table @code +@comment limits.h +@comment ISO +@item CHAR_WIDTH +@comment limits.h +@comment ISO +@itemx SCHAR_WIDTH +@comment limits.h +@comment ISO +@itemx UCHAR_WIDTH +@comment limits.h +@comment ISO +@itemx SHRT_WIDTH +@comment limits.h +@comment ISO +@itemx USHRT_WIDTH +@comment limits.h +@comment ISO +@itemx INT_WIDTH +@comment limits.h +@comment ISO +@itemx UINT_WIDTH +@comment limits.h +@comment ISO +@itemx LONG_WIDTH +@comment limits.h +@comment ISO +@itemx ULONG_WIDTH +@comment limits.h +@comment ISO +@itemx LLONG_WIDTH +@comment limits.h +@comment ISO +@itemx ULLONG_WIDTH + +These are the widths of the types @code{char}, @code{signed char}, +@code{unsigned char}, @code{short int}, @code{unsigned short int}, +@code{int}, @code{unsigned int}, @code{long int}, @code{unsigned long +int}, @code{long long int} and @code{unsigned long long int}, +respectively. +@end table + @node Range of Type @subsection Range of an Integer Type @cindex integer type range |