Algorithms 2 - Intro to Java Programming Udacity English Japanese

Algorithms 2 - Intro to Java ProgrammingYouTube↗ IA↗(long shot)
Education 6.3K views 12 likes 1 dislikes 23 Feb 2015

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All right, here is how I did it. I go through the first step, miles driven is

では算出方法を説明しますまず走行距離は50，000マイルです

50,000. The first miles per gallon is 10. So, that's 5000. The price per gallon

上の車の燃費は１ガロン当たり10マイルなので使用するガソリンは5，000ガロンです

is 4. 5000 times 4 is 20,000. Now moving on to the next step, the purchase

ガソリン代は1ガロン4ドルなので 5，000×4で合計20，000ドルです

price for the first car is 15,000 plus the 20,000. From over here, gets my

上の車は購入価格が15，000ドルガソリン代が20，000ドルなので

total cost of 35000 over the life time of the car. With the second car, again

合計35，000ドルの経費がかかると算出されました

we drive a 50000 miles. Now the miles per gallon is 50. 50000 over 50 is a 1000

下の車の燃費は１ガロン当たり50マイルなので使用するガソリンは50，000÷50＝1，000ガロン

times 4 because we have $4 per gallon, is 4,000 for the gas cost. The purchase

1ガロン4ドルなので計算するとガソリン代は4，000ドルになります

price was 30,000, plus the gas cost 4,000 gets me to 34,000. Now let's go on

購入価格30，000ドルとガソリン代4，000ドルで合計は34，000ドルとなりました

with the algorithm, is total cost one less than total cost two? No it's not,

結果としてtotal cost1はtotal cost2よりも高くなりました

35,000 is bigger than 34,000. So the algorithm tells us to buy car two. Well,

アルゴリズムで算出すると下の車がいいということになります

what a relief. I never wanted to buy that one in the first place. But now I

最初から上の車は買いたくありませんでしたが

have a procedure that is unambiguous, executable, and terminating that tells me

今は明瞭で実行可能かつ終了する手順によってどちらの車を買うかを決断できます

what car to buy. So, this is a great example of an algorithm It is a recipe of

指示の手順であるアルゴリズムを例題で説明しました

steps each of which is so simple that a computer or a human can execute them and it reaches an answer. Now, you will notice that this algorithm here was written up in some mixture of plain English and Math not in Java code or not in

各手順は単純でコンピュータまたは私達が実行でき答えを導けるものですここに書かれたアルゴリズムは普通の英語と数学の組み合わせでできており

any other computer language. This is called Pseudocode, and Pseudocode is

Javaコードやその他のコンピュータ言語でもありませんこれは疑似コードと呼ばれます

really important. When you want to develop an algorithm before you get to coded

疑似コードはプログラミングを行う時 Javaや他の言語を活用する前に使います

up in Java or another programming language. What most programmers do when they

複雑な問題を解決する時に多くのプログラマが使う手法は

need to solve a complex problem is they first get out a sheet of paper and

まず紙を用意して疑似コードで問題を書き出してから

describe the problem in Pseudocode and then they write in Java. Pseudocode

それをJavaで記述するというものです

doesn't have anyway near as many rules as Java does, but so it's a good idea to

疑似コードにはJavaのコードと似通ったルールは一切ありませんが

restrict oneself to simple constructs in Psuedocode. Let me show you what those would be.

まずは構造を簡潔にするという意味で疑似コードは有効です　説明しましょう

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