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What is the purpose of the following keywords?
and bitand compl not_eq or_eq xor_eq
and_eq bitor not or xor
If all they are is a direct equivalent of:
&& & ~ != |= ^=
&= | ! || ^
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Keywords are words that have special meaning to the C compiler. In translation phases 7 and 8, an identifier can't have the same spelling and case as a C keyword. For more information, see translation phases in the Preprocessor Reference. For more information on identifiers, see Identifiers.
A variable can have alphabets, digits, and underscore. A variable name can start with the alphabet, and underscore only. It can't start with a digit. No whitespace is allowed within the variable name. A variable name must not be any reserved word or keyword, e.g. int, goto, etc.
http://en.wikipedia.org/wiki/Iso646.h
iso646.h "...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.
The filename refers to the ISO646 standard, a 7-bit character set with a number of regional variations, some of which have accented characters in place of the punctuation marks used by C operators."
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