Hello world. I'm talking about creating decision tables.

I have a game rock, paper, scissors.

And I want to do a decision table for that.

And so we have two players each show their hand as either a rock which is a closed fist, paper with all the fingers out, or scissors with two fingers out.

And then the paper beats rock,scissors beats paper.

and rock

beats scissors, and if the two players both show the same thing it's a tie.

So I'm going to use.

Excel to create this.

So, we have Player A,

Player B,

And the result.

It's a little like counting: we want to start them both off with the first value.

And then

We go, we increment, it's like counting.

So, after rock is paper.

And

then scissors.

Player A we still have rock. We want to show every possible combination.

Once we've done all three of those values, we start over in this position.

Go to the next one in that position.

So after rock is paper.

And we're going to have Rock.

Paper.

scissors here

And stay with.

Paper there.

I'm going to copy that

And now this is scissors.

here

So now the important part is the results So everywhere

If we have.

If the two are the same it's a tie.

So let's go through and do that rule first.

So they're both rock.

They're both paper.

And they're both scissors.

Let's look at the next rule.

Paper beats Rock. So if we have paper here and rock here.

then B wins.

And where else do we have rock and paper? So we should have.

Paper and rock here.

And A wins.

And our next rule is scissors beats paper.

And so we need a place we have scissors and paper.

And scissors beats paper so this would be B wins.

And here we have.

This should be.

A wins.

And our next rule.

Is rock beats scissors.

So here we have A wins.

And here we have B wins.

And we should have three ties.

Three where B wins

And 3 for A wins.

And that looks good. That's a very simple decision table and it can't be reduced. We'll look at an example where something could be reduced.

In the next video.