Tidying Legos - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  8.8K views 14 likes 1 dislikes   23 Feb 2015
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In your pseudocode, you may want to write a computation. Such as the total cost equals purchase price, plus the cost of gas. You might want to have a decision.
疑似コードで計算方法を書き出しましょう 例えば合計額＝車の購入価格＋ガソリン代です 次に条件分岐も書き出します
If the total cost 1 is less than the total cost 2 to one thing, else to another
total cost 1がtotal cost 2よりも少ない場合に どうするかなどです
thing. You might want to repeat certain steps. While the bank balance is less
特定の処理を繰り返すこともあります 銀行残高が一定の金額より少なかった場合に
than your target, or repeat some actions say, ten times. Those are the three
その処理を10回繰り返すなど
essential elements of pseudocode. Computations or other actions without any regard of the syntax of a particular programming language. When you're doing programming there are two things that you need to learn, that's syntax of the
これら3つは疑似コードの重要な要素です プログラミング言語の文法を使わずに 計算方法や他の処理を書き表したものです プログラミングする際に必要な知識が2つあります
programming language and how to solve problems. And we'll do this in parallel on two tracks. In the next lesson, you'll learn quite a bit more about how to work with the programming language. But right now let's learn a little bit more about algorithms, pseudocode, and problem solving. You've just seen an
プログラミング言語の文法と問題の解決法です その2つを並行して学んでいきましょう 次回の講義ではかなり詳しく プログラミング言語の文法を学びますが ここではもう少しアルゴリズムと疑似コード そして問題の解決法について見ていきます
algorithms that manipulated numbers to give you a useful answer. But I thought
先ほどの例ではアルゴリズムが数字を操って 答えを導きましたが
it would be more fun to show here a few example that don't have to do with
数字を使わない もっと面白い例題があるんです
numbers. So here is Robbie our home robot. A robot is a computer too, it
これは家庭用ロボットのロビーです ロボットもコンピュータなので
carries out tasks and one has to program it to do the right thing. Right now
人が正しく指示をプログラミングすれば 仕事を実行してくれます
Robbie's task is. To clean up a bunch of legos, Robbie needs to put all the
ここでのロビーの仕事は レゴブロックを片づけることです
blue legos before all the yellow legos. Here's our first attempt at an
ロビーはこの青いレゴブロックすべてを あらゆる黄色のレゴより左に並べます
algorithm. It's a sequence of steps. Robbie will wave his magic wand and he will say, make it so. Well, that's not really going to work. An algorithm has
ここでアルゴリズムを考えてみましょう 例えばロビーは魔法の杖を振り“並べ”と言う いいえ　それでは何も解決できません
to be executable. And not involve magic steps. Our pseudocode, here, asks
アルゴリズムは実行可能でなくてはなりません 魔法ではないのです
Robbie to repeatedly execute these statements. Namely, why all the blocks are not yet in order. Each time, Robbie is supposed to scan the sequence of blocks.
これが疑似コードです　ロビーには繰り返し これらの命令を実行してもらいます ブロックがちゃんと順に並ぶまでと指示します その都度ロビーはブロックの列をスキャンします
Find the first one that's yellow before blue one, and swap. So Robbie would go
最初に青の左隣に黄色がある箇所を 見つけて入れ替えます
along starting at the left, until it finds the yellow one before blue one. Swap
そしてロビーは左端へ戻り　再び青の左隣に 黄色がある箇所を見つけて入れ替えます
the two. And then it would do it again. In the next step, it would scan from
ロビーはこれをくり返します
the left until it finds the yellow one before blue one and swap them, and
次もブロックの列をスキャンして　青の左隣に 黄色がある箇所を見つけて入れ替えていきます
again. Now I'd like you to try this. If I write a b for blue and a y for yellow, tell me the sequence of the blocks after the next slot, and the next one after that.
ではここで青をbとし黄色をyとします 次にロビーが並べ替えると配列はどうなるでしょう そしてその次は?
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