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For portable applications, use only the assignment = operator, the equality operators == and !=, and the unary & operator on plain character or plain wide character-typed expressions.
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The following example would seem to check if the value of a character variable is between 'a' and 'c' inclusive. However, since it is not required by the C99 standard that the letter characters be consecutive nor in alphabetical order, the check might not work as expected.
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