(2) Set operation: Union, Intersection and difference

?Problem description?

Write a program to demonstrate the union, intersection and difference operation of set.

?Basic requirements?

?(1) the set elements are limited to letters in lower case [a..z].

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?Test data?

?(1)Set1="magazine"?Set2="paper"?

?Set1?Set2="aegimnprz"?Setl ?Set2="ae"?Set1-Set2="gimnz"?

?(2)Set1= " 012oper4a6tion89"?Set2="error data"?

?Set1?Set2="adeinoprt"?Setl ?Set2="aeort"?Set1-Set2="inp"?

?Hint for implementation?

?array can be used to represent the set.