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Categories of Operators and Punctuators |
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The operators # and ## are
used only by the preprocessor.
Depending on context, the same operator can have more than one meaning. For
example, the ampersand ('&') can be interpreted as
A & B);
&A);
'&' is a unary operator; in the second, the '&' is a
binary operator. Similarly, the comma ',' may act as an operator and as a
punctuator, etc.