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In this noncompliant code example, EOF is defined as -1. The macro replacement list consists of a unary negation operator ' - ' followed by an integer literal ' 1'.
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#define EOF -1
/* ... */
if (getchar() EOF) {
/* ... */
}
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enum { EOF = -1 };
/* ... */
if (getchar() != EOF) {
/* ... */
}
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Exceptions
PRE02-EX1. : A macro that expands to a single identifier or function call is not affected by the precedence of any operators in the surrounding expression, so its replacement list need not be parenthesized.
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