Exercise 5.13: consecutive
Write a method named
consecutive that accepts three integers as parameters and returns true if they are three consecutive numbers; that is, if the numbers can be arranged into an order such that there is some integer k such that the parameters' values are k, k+1, and k+2. Your method should return false if the integers are not consecutive. Note that order is not significant; your method should return the same result for the same three integers passed in any order.
For example, the calls
consecutive(1, 2, 3),
consecutive(3, 2, 4), and
consecutive(-10, -8, -9) would return true. The calls
consecutive(3, 5, 7),
consecutive(1, 2, 2), and
consecutive(7, 7, 9) would return false.
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