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The starter code contains the point struct from last week, and an implementation of operator==
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Tasks:
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Implement operator!=
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Implement (binary) operator+ and operator-
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Implement operator+= and operator-=. What type should these functions return? (Think: do as the ints do!)
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(Harder) Implement operator<< for output streams
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Test all your operator overloads in your main() routine
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