iso646.h

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C Standard Library headers

assert.h complex.h ctype.h errno.h fenv.h float.h inttypes.h iso646.h limits.h locale.h math.h setjmp.h signal.h stdarg.h stdbool.h stddef.h stdint.h stdio.h stdlib.h string.h tgmath.h time.h wchar.h wctype.h

The iso646.h header file is part of the C standard library. It was added to this library in a 1995 amendment to the C90 standard. It defines a number of macros which allow programmers to use C language bitwise and logical operators, which, without the header file, cannot be quickly or easily typed on some international and non-QWERTY keyboards.

[edit] The macros

The iso646.h header defines the following 11 macros as stated below:

• and defined as &&
• and_eq defined as &=
• bitand defined as &
• bitor defined as |
• compl defined as ~
• not defined as !
• not_eq defined as !=
• or defined as ||
• or_eq defined as |=
• xor defined as ^
• xor_eq defined as ^=

[edit] C++

These symbols are keywords in the ISO C++ programming language and do not require the inclusion of a header file. For consistency, however, the C++98 standard provides the header <ciso646>.

[edit] External links

• <iso646.h> by OpenGroup