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Real numbers aren't particularly important in typical Prolog applications. So although most Prolog implementations do support *floating point numbers* or *floats* (that is, representations of real numbers such as 1657.3087 or ) we are not going to discuss them in this course.

But *integers* (that is: ... -2, -1, 0, 1, 2, 3, ...) are useful for such tasks as counting the elements of a list, and we'll discuss how to manipulate them in a later lecture. Their Prolog syntax is the obvious one: `23`

, `1001`

, `0`

, `-365`

, and so on.

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Patrick Blackburn, Johan Bos and Kristina Striegnitz

Version 1.2.5 (20030212)