In this exam, you will write a C++ class IntSet that maintains a set of integers and has the following methods:

• IntSet(), the constructor that creates an empty integer set.
• int isMember(int i), check if the input integer i is a member of the set, return 1 if it is, otherwise return 0.
• int insert(int i), insert integer i into the set, return 1 if the insert is successful, and 0 otherwise.
• int delete(int i), delete integer i from the set, return 1 if i is deleted from the set, and 0 if i is not in the set.
• void print(), print out all the elements of the set to the screen.
• IntSet IntSet::union(IntSet S), return the union of this set and the input set S.

IntSet IntSet::intersection(IntSet S), return the intersection of this set and the input set S