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A whole number. The following are integers: 0 1 -125 144457 In contrast, the following are not integers: 5.34 -1.0 1.3E4 "string" The first three are floating-point numbers; the last is a character string. Integers, floating-point numbers, and character strings constitute the basic data types that most computers support. There are often different sizes of integers available; for example, PCs support short integers, which are 2 bytes, and long integers, which are 4 bytes.
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