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The following are all valid calls to the above method:
sum()--> returns zero.sum(42)--> returns 0+42 = 42.sum(10, 20)--> returns 0+10+20 = 30.sum(100, 1000, 10000)--> returns 11100 etc
Vararg input parameters are very useful when you might want to call a method, such as the accept method of a host (and hence a case on the visitor), with varying numbers of input parameters, or perhaps, none at all.
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