Formatted Output - Intro to Java Programming Udacity English Japanese

Formatted Output - Intro to Java ProgrammingYouTube↗ IA↗(long shot)
Education 4.2K views 27 likes 0 dislikes 23 Feb 2015

Udacity 651K subscribers United States YouTube↗

Now that you've seen user input, let's turn to another topic, formatted output.

ユーザ入力を見てきましたが次は書式付き出力に進みます

Let me show you why we need to know about it. Let's look at this program here.

その必要性も説明しますこのプログラムを見てください

I want to buy 100 cans of my super premium cat food at $4.35 a can. So, my

1缶4．35ドルのスーパープレミアムキャットフードを 100個買いたいと仮定します

total price is going to be the quantity times the unit price. So, I'll print

合計金額は1缶の単価に個数をかけたものになります

it. There's also 8% tax so, here I'm figuring up the tax, and then I'm printing

それを出力しますさらに8パーセントの税金もかかります

that. Let's see what this program does. Well, look at it. It's ugly, ugly.

税金を計算して出力します見てみましょうひどい数字が出てきました

Here, I expected to see $435, and the tax, you never see tax like that on your store receipt. It would say $34.80. So that's what I want. And by the way, I

ここでは435ドルになるはずでしたまたこんな数字の税金がレシートに表示されるはずがありません 34ドル80セントになるはずですこうなってほしいのです

want these decimal points here to line up. It turns out, that's pretty easy to

この場合小数点の位置をそろえた方が簡単です

do. Here, instead of just calling println, we'll call a different method. It's

ここでprintlnではなく別のメソッドを呼び出します

called printf for print formatted, and here, we need to add a formatting

printfと呼ばれる書式設定されたプリントです

string. The formatting string is here, it looks a little arcane. The percent

ここで書式文字列を追加します複雑そうに見えますね

says we're now going to be printing something. The 8 means we want it to be 8

このパーセントは何かを出力することを示します

characters wide, the 0.2 means, we went 2 digits after the decimal point. The f

8は8文字が並ぶ幅にすること 0．2は小数点のあとが2桁になることを示します

means it's a floating point or decimal number. The \n means, and afterwards, please give us a new line. As you can see, there's a whole mini language in these formatting strings and you'll practice a few of them with Sarah, after

このfは浮動小数点もしくは小数の数字です＼nは“あとで新しい行を与えてください”という意味ですこの書式文字列の中にミニ言語があります

I'm done here. But truth be told, if you simply memorize this one. Or even

私のレッスンのあとでサラといくつか練習しますしかしこれを覚えられるかどうか分からないので

better just copy and paste it when you need it. That's 90% of what you need.

コピー＆ペーストする方がいいでしょうそれで十分事足ります

Let me do just that. So, here again, I'm going to be using a printer. I'm

ではここで再びprintfを使います

saying I want field with 8. 2 digits after decimal point. Now, when we run the

幅は8文字が並ぶようにして小数点のあとは2桁にします

program everything is nice and beautiful. Both numbers have two digits after the decimal point. Both of them occupy eight characters. As a general rule,

プログラムを起動するとうまくいきましたどちらの数字も小数点の後は2桁になりましたさらにどちらも8文字が並ぶ幅になっています

whenever you display prices, go ahead and use printf. You'll practice that with Sara right now.

通常のルールとして価格を表示する時はprintfを使いますそれではサラと練習してみましょう

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