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Congratulations! You win!2

last was too small?true1last was too small?false1You guessed it! My secret number was . It took you guesses.2There are a lot of pieces here. Maybe the most important is the LAST WAS TOO SMALL? variable, which is needed to know whether the current guess is wrong in the same direction as the previous guess. If so, a "still too small" (or big) sort of message is appropriate. If not, just plain "too small" is appropriate. The initialization of that variable has to be such that we give a plain "too small" or "too big" the first time. I knew that the value should depend on the small/bigness of the initial guess, but it gave me a headache trying to figure out which way the inequality should go, and I changed my mind a few times, until finally I just picked one, tried it out, and changed it when it turned out to be wrong. This is a perfectly okay programming technique as long as you don't forget you've made a guess that needs experimentation. The actual production of responses can be arbitrarily complicated! For example, you could add a "you guessed that already" message. For this solution I wrote three responses in each direction, meant to be given in order, and then just removed the first one from the list after using it (so you're always using the first one of the list as it then exists). If the list gets empty, for the fourth consecutive error in the same direction, just restart from the initial list of three responses. This part gives a great range for student creativity, although the big computer science idea is the variable to remember the result of the previous guess.

You guessed it! My secret number was . It took you guesses.2TIF 3.AIn TIF 3.A, note that NUMBER OF GUESSES starts at 1, not 0. Even if the REPEAT UNTIL never runs, the user still made one guess. This sort of slightly unusual initialization is a very common source of bugs.