Write a method named numUnique that accepts three integers as
parameters and that returns the number of unique integers among the three.
For example, the call numUnique(18, 3, 4) should return 3
because the parameters have 3 different values. By contrast, the
call numUnique(6, 7, 6) would return 2 because there are only
2 unique numbers among the three parameters: 6 and 7.
Compare your solution to your neighbors'. Did you all solve it the same way?