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@node Language facilities
@chapter Language facilities
@menu
* Alternative tokens:: Alternative spellings of common operators.
@end menu
@node Alternative tokens
@section Alternative tokens
@hfindex iso646.h
@cpindex Alternative tokens
@cpindex Tokens, alternative
The C90 standard was amended in 1995 to include
alternative spellings of common operators, referred
to as C alternative tokens.
@table @code
@item and
@fnindex and
@code{&&}
@item and_eq
@fnindex and_eq
@code{&=}
@item bitand
@fnindex bitand
@code{&}
@item bitor
@fnindex bitor
@code{|}
@item compl
@fnindex compl
@code{~}
@item not
@fnindex not
@code{!}
@item not_eq
@fnindex not_eq
@code{!=}
@item or
@fnindex or
@code{||}
@item or_eq
@fnindex or_eq
@code{|=}
@item xor
@fnindex xor
@code{^}
@item xor_eq
@fnindex xor_eq
@code{^=}
@end table
These alternative spellings are implemented as a
group of macro constants, and are made available
by including the header file @file{<iso646.h>}.
They were added because a concern that the standard
names are difficult to type on some keyboard-layouts.
Use of these alternative tokens are discouraged,
they lessen the readability of your code. If it is
difficult to type some characters without yout
keyboard-layout, it is better to change keyboard-layout.
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