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4.2.1 Introduction to Numbers
There are three types of numbers recognized by CoCoA: integers (type INT), rationals (type RAT), and modular integers (type ZMOD). Numbers in CoCoA are handled with arbitrary precision. This means that the sizes of numbers are only limited by the amount of available memory. The basic numeric operations---addition (+), subtraction (-), multiplication (*), division (/), exponentiation (^), and negation (-)---behave as one would expect. Be careful, two adjacent minus signs, --, start a comment in CoCoA.

  N := 3;
The last line in the above example does not return 3; it is interpreted as a comment.