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I hope you enjoyed this section on getting an understanding of how macros are created and how they work.

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We are now going to go over the solution for the assignment for this section.

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The question is create a macro called OP that takes three arguments.

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All three arguments will be integers.

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But the third argument is going to be how we tell the macro what operation to perform.

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Operation one is add.

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Operation two is subtract, three is multiply, four is divide and five is mod.

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So I went ahead and put all of the example outputs that we are looking for and to Main so now that we

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can create our macro rule.

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So we start off by saying macro rules, we give it a name.

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In this case it is going to be OP and now we are going to specify the parameters that we want.

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So we will say a.

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B and C, which is going to be how we specify what operation we want to perform on A and B, so now

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we can very easily just run a match block on all of these.

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And we will say one is going to return A plus B, you need to put that dollar sign.

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Two is going to return A minus B, three is going to return A times B, four is going to return a divide

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by B, five is going to return the mod A, mod

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B, and then if any other value is passed in, that is not one, two, three, four, five, we will

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just return negative one so that we know that we passed in some unexpected operation.

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So now if we run our macro, we expect to get the appropriate values of seven, three, 10 to 1, and

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then negative one.

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So I hope you enjoyed this assignment on creating your own custom macro that is going to allow you to

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specify what operation to run on to arbitrary values.