#ASSIGNMENT 42 GENERATOR#
Another approach is to take some “random enough”Ĭharacteristic in the program’s environment a classic trick is to take the computer’sĬurrent time and date to the precision of, say, a nanosecond, and seed the generator with There are different ways of picking a seed. This can be either a blessing (if we wish to replicate a sequence that was originallyĬhosen at random) or a curse (if we want a distinct sequence every time). Given a particular seed, an algorithm always produces the same pseudorandom numbers. We pass the seed as a constructor parameter (e.g., 74534161 above) Scala’s Random class uses one such algorithm (which we won’t inspect more closely Mathematicians have developed various algorithms that generate pseudorandom numbers. In our example algorithm, N was the seed ever time weĪpply the algorithm with an N of 20, we get the same result. Given the same “starting number”, known as a seed ( siemen), we always get the same The numbers produced by such an algorithm are pseudorandom numbers ( näennäissatunnaisluku). (As it turns out, “thin air” is actually pretty close.) A computer can’t simplyįor more information, take a look at Introduction to Randomness Randomness is hard not just to us humans but computers, too. Let that be the first “random number”.ĭetermine the next “random number” by taking the another digit Start by picking some number N, say N=20. One practical option is to use a “good enough” mathematical algorithm for computing a The assignment “Pick 30 fully random numbers between 0 and 9.” is easier said than done. The generation of random numbers is too important to be left to chance. Then modify the approach method in the same class. For example, if an obstacle has a radius of 50 and an xĬoordinate of -50, the obstacle still just counts as active, but if the coordinate was Of the screen’s left edge, or if it’s exactly at the screen’s left edge. It returns true if the obstacle’s right edge is located to the right Task descriptionīegin by adding an effect-free method isActive in class Obstacle. We will now pick the secondĪpproach, which is easy to implement. Neither approach is unambiguously better than the other. Over and over again, but in practice, it will look like new
Sense, the bug will keep encountering the same obstacle object Of the view simply by changing its coordinates. Is no longer “active”, we instantly move it to the right-hand side Previously linked to the Game with this new obstacle. Is no longer “active”, we create another Obstacle object on the Once the obstacle has moved out of sight beyond the left edge and In our current version of FlappyBug, we have only a single obstacle that glides across Assignment: FlappyBug (Part 13 of 17: An Obstinate Obstacle) Foreword May be challenging and take a substantial amount of additional time. Will probably take you less than an hour.
Rough Estimate of Workload: ? The main assignments I write a game or simulation where I can move a character about Questions Answered: How about some more practice on ifĮxpressions? How can I make my game more unpredictable? How can
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