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Before we start, did you try solving the workbook yourself?

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If not, please click the link in the resources folder and follow the instructions for this workbook.

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This video will present the solution to workbook 3.3.

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We're going to visualize the runtime again using code.

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So please make sure that you launch the exact folder that contains your java file.

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Do not, under any circumstance launch all of the resources at once.

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If your file explorer looks like this, you will not be able to visualize their runtime.

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All right.

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First, we need a variable that calculates the margin of points Gryffindor stored over Ravenclaw.

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So we can say int margin is equal to the amount of points by which Gryffindor stored over Ravenclaw.

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And the margin of points that Gryffindor scored over the other team will determine their ranking.

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So if Gryffindor wins by a margin of 300 points or greater.

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Then we're going to say Gryffindor takes the House Cup.

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Now, if this condition fails, that means Gryffindor did not earn enough points.

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So the next condition we're going to check for is if they won by any margin of points or tied.

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So if margin is greater than or equal to zero.

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If that happens to be the case, then they are in second place.

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So we're going to print.

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In second place Gryffindor.

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However, if the points margin happens to be less than zero, if Gryffindor actually loses to Ravenclaw,

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then this condition will also be false.

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So the next thing we have to check for is how much did they lose by if they lose within 100 points,

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if they lose by a margin of 100 points or less, then they are in third.

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So here we can say else if margin is greater than or equal to -100.

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Then they are in third and third place Gryffindor.

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Now, finally, if Gryffindor loses by more than 100 points, then this condition is also going to fail.

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So the last possible scenario that we can represent using else is where Gryffindor is in last place.

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Perfect.

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Now we can visualize the runtime.

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And if you want to visualize the runtime for a series of if elseif and else, what you want to do is

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only put one breakpoint at the very beginning.

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All right.

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And you know what?

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We'll put breakpoints here as well.

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And our first test case will be Gryffindor winning by a margin of 200 points.

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So let us visualize the runtime.

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Dismissing this window.

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All right.

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Cleaning up a little.

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So here it creates a points variable of 400 and then Ravenclaw score 200 points.

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So Gryffindor won by a margin of 200 points.

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A margin of 200 is not greater than or equal to 300.

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So unfortunately they are not in first place.

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Please don't press continue.

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We want to step over everything step by step.

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So we'll press the step over button.

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This is how you visualize a series of if if you put one breakpoint and then you keep stepping over.

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And now a margin of 200 is greater than or equal to zero.

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So this will evaluate to true.

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And Gryffindor is in second place and now you can press continue in test case number two, Gryffindor

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will score 850 points, whereas Ravenclaw scores 500.

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Let us re visualize the runtime.

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This time Gryffindor won by a points margin of 350.

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350 is greater than or equal to 300.

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So this condition evaluates to true, which means this statement will run.

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Gryffindor are the champions.

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All right.

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Test.

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Case number three is where Gryffindor scores 620 points, but Ravenclaw only scores 500.

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Let us visualize the runtime.

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This time Gryffindor won by a margin of 120 points.

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Now we're going to step over the chain of F, l, f, and L statements.

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So the margin of 120 is not greater than or equal to 300.

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This evaluates the false margin of 120 is greater than or equal to zero.

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This evaluates the true and Gryffindor will come in second place.

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All right.

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Test case number four is when Gryffindor scores 450 points, but Ravenclaw actually has more points

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than them.

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So let's visualize the runtime.

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So here it appears that Gryffindor lost by a margin of 50 points.

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-50 is not greater than or equal to 300.

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This evaluates the false the if statement does not execute -50 is not greater than or equal to zero.

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So this also evaluates the false.

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-50 is greater than or equal to -100.

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So Gryffindor did manage to only lose within 100 points, which means they will be in third place.

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Test case number five.

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100.

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500.

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This time Gryffindor loses by 400 points.

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So the margin of points is -400.

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That's how much they lost by.

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This is going to evaluate the false so the statement will not execute.

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This also evaluates the false because -400 is not greater than or equal to zero.

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This is also going to evaluate the faults because they did not lose within -100.

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They lost by 400 points.

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So we default to the statement where they are in fourth place.

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And that's all.

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I hope you enjoyed this breakpoint session.