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

Like many games, this is coded as a FOREVER loop, with a STOP THIS BLOCK to escape when we win or detect an inconsistency. It uses two global variables, one to count the number of guesses and the other for the buttons to tell us when they are pressed. There are more elegant ways to accomplish the latter, but they'd result in multiple WHEN I RECEIVE scripts, and we'd have to make LOW and HIGH global for those scripts to use. Also, we change the values of our input variables, which some people would consider bad style. But since those variables are local to this procedure, it really doesn't hurt anyone outside this script. Students will organize their code in many different ways. It might be useful to have them flag with comments where each of the five steps (or however many steps /their/ algorithm has) is carried out.

110i

1

cont

catchtag

cont

catchtag

Sprite

Sprite

guess22This is essentially the game program, but with the user interface parts removed. I also replaced the FOREVER loop with a REPEAT UNTIL. I think FOREVER is okay for games, but in a serious program the stopping condition for the loop should be self-documenting. (There's still an early stop if the error condition LOW>HIGH occurs. In this case it means that the supposedly sorted list given as input isn't sorted, or if the desired item isn't in the list.)

Each item of DATA is a list of two numbers, the x and y coordinates of a point. The ITEM blocks extract the two numbers. An item from DATA is substituted into the empty list slots. (If you prefer you could drag the ITEM orange block from the FOR EACH into those slots -- the meaning is the same.)

This is straightforward apart from the two points brought out on the lab page: 1. How to declare an input of type Reporter. 2. How to call that function and give it an input. Otherwise it's just figuring out the WAIT UNTIL / REPEAT UNTIL structure, and remembering from two pages back to put the PEN DOWN /after/ moving to the first point.

i11truedatatrueThis so much calls out for a recursive solution that I couldn't help putting that first. CONTAINS is a primitive block. Students who remember that will have a much easier time writing this procedure than those who don't remember it. The other thing that will complicate the solution is if the students have programmed before in one of those other languages and therefore insist on using index variables to find their way through the list instead of ALL BUT FIRST OF. Here are a few examples of possible correct solutions:datatrue

10

LABEL will stamp text on the stage at the given font size. The direction of the text is the direction the sprite is facing, and color will match the pen color.

Hello!12

1

1