Fundamentals of CS I (CS151 2001S) : Reference

abs: compute absolute value

Parametersn, a number
PurposeComputes the absolute value of n.
ProducesA number. If n is not negative, produces n. If n is negative, produces the opposite of n.
PreconditionsOnly one parameter (verified).
n is a number (verified).
PostconditionsThe result is the same kind of number (integer, exact, inexact, etc.) as the parameter. The result is not negative.
> (abs 0)

> (abs -1.5)

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