A must therefore be an integer - though which integer it is is unclear and needs further explanation.
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No, a whole number can be negative (or zero).
No, zero is not negative or positive.
An integer is any negative or positive whole number, or zero.
A non-zero integer.
An integer is a whole number (not a fraction) that can be positive, negative, or zero. A member of the set of positive whole numbers {1, 2, 3, . . . }, negative whole numbers {−1, −2, −3, . . . }, and zero {0}.