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! Logical NOT operator (unary)
!exp logical NOT
exp any integral type (int, char, enum, etc.)
The unary operator ! performs a logical inversion on exp. If exp has a
value of FALSE, then !exp has a value of TRUE. If exp has a TRUE
value, then !exp has a value of FALSE. Here are two examples:
j = 256;
i = !j; # i == 0
j = 0;
i = !j; # i == 1
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