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Oct 23, 2012Download as pptx, pdf0 likes187 views

Tatsuya Ishiguro

( ^o^)＜この問題難しいなー。
( ^o^)＜少しネットでやり方を調べて
みよう！

ぐーぐる

三項演算子を使った例

(??。??)（ん？三項演算子だ…。
これはちょっとわかりずらいやつか。）

ネタはここまでにして…。

? 三項演算子はパッと見でわかりずらいので
は？
? if?then?else?で代替がきくのでは？
? 省略するとますますわからない人には
わからなくなるのでは？

Wikipediaより引用
? “CやJavaやPerlなどでは、a ? b : c ? d : e は
a ? b : (c ? d : e) という意味だが、PHPの三
項演算子では (a ? b : c) ? d : e なので注意が
必要である。”（右結合か左結合か）

＿人人人人人人人人人人人人人人人人人人人＿
＞言語によって違うならもっとわからない
よ！＜
￣^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^￣

メリット
? If?then?elseでは書けないものを書くこ
とができる（代替できないものも存在す
る）
知らなかった

例：const bool c = (a != b) ? true : false;
（が石黒はこれが理解できないので教えて下さい
…）

出典：http://d.hatena.ne.jp/tt_clown/20100806/1281088936

デメリット
? 可読性の問題
多くの人が読みづらい
↓
プログラミングの本来のメリットである
人間でも理解できるという点が損なわれる
? 少し調べた感じではPHPだけ？
言語によって左結合と右結合か違う
↓
複数の言語を扱う人にとって不便

しかし

“可読性がうんぬん言ってるのって
能力の低さの露呈では？”
という声もどっかで見た
もうやめて！たつおのライフはゼロよ！(?；ω；｀)

あるいは“俺が読めないコードはくそだ！”
という表現になるので可読性批判はちょっとよくない。

結論
? 結局三項演算子でなければ書けないもの
があるので理解するほかない。
? 主だった言語の中ではPHPだけが特殊なの
でそこに注意すればよい

いろいろな三項演算子
? 多くの言語
条件式？式１：式２
（PHPは左結合それ以外は右結合）
例：$flag1=true; $flag2=false;
echo $flag1 ? 1 : $flag2 ? 2 : 0; //出力は2
? Python
A = Y if X else Z（ちょっとわかりやすい！）
? シェルスクリプト
条件式？式１：式２
（shでは使えない、bashのみ使用可能
さらに文字列は使えない）

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esys01krtt

1. システム班LT 第一回資料 NE24-0175D 石黒达也

2. お題三項演算子について

3. きっかけとある日、Atcoderの問題を解いているときに…

4. ( ^o^)＜この問題難しいなー。 ( ^o^)＜少しネットでやり方を調べてみよう！

5. ぐーぐる三項演算子を使った例 (??。??)（ん？三項演算子だ…。これはちょっとわかりずらいやつか。）

6. ( ???) 。o(待てよ、なんでわざわざわかりずらいものを使ってるんだ？)

7. |えろい人|┗(?｀ )┓三

8. ( ??? )?お前は無知ゆえに消えてもらおう

9. ▂▅▇█▓??('ω')??▓█▇▅▂ うわあああああああああああ

10. ネタはここまでにして…。 ? 三項演算子はパッと見でわかりずらいのでは？ ? if?then?else?で代替がきくのでは？ ? 省略するとますますわからない人にはわからなくなるのでは？

11. Wikipediaより引用 ? “CやJavaやPerlなどでは、a ? b : c ? d : e は a ? b : (c ? d : e) という意味だが、PHPの三項演算子では (a ? b : c) ? d : e なので注意が必要である。”（右結合か左結合か）＿人人人人人人人人人人人人人人人人人人人＿＞言語によって違うならもっとわからないよ！＜￣^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^￣

12. メリット?デメリットを调べて见ることに

13. メリット ? If?then?elseでは書けないものを書くことができる（代替できないものも存在する）知らなかった例：const bool c = (a != b) ? true : false; （が石黒はこれが理解できないので教えて下さい …）出典：http://d.hatena.ne.jp/tt_clown/20100806/1281088936

14. デメリット ? 可読性の問題多くの人が読みづらい ↓ プログラミングの本来のメリットである人間でも理解できるという点が損なわれる ? 少し調べた感じではPHPだけ？言語によって左結合と右結合か違う ↓ 複数の言語を扱う人にとって不便

15. しかし “可読性がうんぬん言ってるのって能力の低さの露呈では？” という声もどっかで見たもうやめて！たつおのライフはゼロよ！(?；ω；｀) あるいは“俺が読めないコードはくそだ！” という表現になるので可読性批判はちょっとよくない。

16. 結論 ? 結局三項演算子でなければ書けないものがあるので理解するほかない。 ? 主だった言語の中ではPHPだけが特殊なのでそこに注意すればよい

17. いろいろな三項演算子 ? 多くの言語条件式？式１：式２（PHPは左結合それ以外は右結合）例：$flag1=true; $flag2=false; echo $flag1 ? 1 : $flag2 ? 2 : 0; //出力は2 ? Python A = Y if X else Z（ちょっとわかりやすい！） ? シェルスクリプト条件式？式１：式２（shでは使えない、bashのみ使用可能さらに文字列は使えない）

18. ありがとうございました

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