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    ###### tags: `minecraft` <style> * {font-family: 'Terminal','ヒラギノ丸ゴ ProN','Hiragino Maru Gothic ProN',YuGothic,'Yu Gothic','Hiragino Kaku Gothic ProN','ヒラギノ角ゴ ProN W3','Verdana','Arial',sans-serif;} .markdown-body {font-family: 'Terminal','ヒラギノ丸ゴ ProN','Hiragino Maru Gothic ProN',YuGothic,'Yu Gothic','Hiragino Kaku Gothic ProN','ヒラギノ角ゴ ProN W3','Verdana','Arial',sans-serif;} h2 {padding-top: 50px;} img {margin: 20px auto;} .alert-success {margin-top: 50px;} .alert h2 {padding-top: 0px;} .part {letter-spacing: .1rem;} .markdown-body h3 {margin-top: 12px;margin-bottom: 12px;} .markdown-body p {font-size: 1.25em;margin-top: 12px; margin-bottom: 16px;} .markdown-body li {font-size: 1.25em;} .markdown-body pre {font-size: 20px;} .focus {color: red;font-weight: bold;} .link-box {display: flex;justify-content: space-between; margin-top: 50px;margin-bottom: 50px;} a.link {display: block; width: 50%; padding: 10px 15px; text-align: center; color: #fff; font-weight: bold; font-size: 20px; letter-spacing: .1em; text-decoration: none;} a.link:hover {opacity: 0.85;} a.prev {background: linear-gradient(to bottom, #1A7BBD 0%, #1A7BBD 50%, #125684 51%, #125684 100%); border-radius: 10px 0 0 10px;} a.next {background: linear-gradient(to bottom, #D76820 0%, #D76820 50%, #964816 51%, #964816 100%); border-radius: 0 10px 10px 0;} </style> > [name=shinya kunisada] # 【第13回】 障害物をよけて進ませよう! :::success ### 【今回の目標】 - ### 『パスワードもどき』を作ってみよう - ### ブロックがあったらよけて進ませよう! ::: ## ◆ 場合によって違う命令をしたい ### 今回は<span class="focus">場合や状況によって違う命令を実行する</span>ことを考えよう! ### 例えば... ### 鉄だけ掘るようにしたいとき、ブロックが鉄のときと鉄以外のときでは命令が違うはずだね! ![](https://i.imgur.com/dba8ocv.png) ## ◆ if文 ### 条件によって命令を変えるには<span class="focus">if文(いふ文)</span>を使うよ! ![](https://i.imgur.com/Oxu5XrM.png) ### if文は開始部(条件部)と命令部と終了部の3つでできているよ! ![](https://i.imgur.com/uTRF9fX.png) ### if文は<span class="focus">条件部の条件を満たしているときだけ</span>命令部に書いた命令を実行するよ ![](https://i.imgur.com/Cmr97ZJ.png) ## ◆ 条件式って? ### if文には<span class="focus">条件式</span>が必要 ### 条件式では<span class="focus">特別な記号を使って数を比べたりする</span>よ ![](https://i.imgur.com/tAX37qS.png) ## ◆ 【条件式のパターンその1】<span class="focus">数や式が同じかどうか</span> ### 2つの数や文字が同じかどうかは <span class="focus">==</span> で確かめることが出来るよ! ![](https://i.imgur.com/6lYZp3f.png) :::success ## 【課題1】 パスワードもどきを作る ::: ### io.read()命令で文字を入力して、入力した文字が「TechChance」のときだけ <span class="focus">YES</span> と表示しよう! ![](https://i.imgur.com/rLOnH84.png) ## ◆ else ### <span class="focus">else(エルス)</span>を使うと<span class="focus">ifの条件式を満たすとき以外の命令</span>を決めることが出来るよ ![](https://i.imgur.com/YRXwGLJ.png) ### <span class="focus">elseは必ずifとendの間</span>に書かないといけないよ! ![](https://i.imgur.com/S0bqgEG.png) :::success ## 【課題2】 パスワードもどきの改良 ::: ### 課題1を改良して、elseを使って「TechChance」以外の時は <span class="focus">NO</span> と表示できるようにしよう ![](https://i.imgur.com/GOy5XPb.png) ## ◆ true と false ### <span class="focus">turtle.detect()命令</span>で<span class="focus">true</span>と<span class="focus">false</span>が出てきたね! ### これも判定に使うことができるよ ![](https://i.imgur.com/ornmxiX.png) :::success ## 【課題3】 turtle.detect()命令の復習 ::: ### <span class="focus">turtle.detect()命令</span>で目の前にブロックがあるかどうかをtrueとfalseで表示しよう! ## ◆ 【重要】 trueとfalseをif文に使う ### <span class="focus">true</span>や<span class="focus">false</span>は<span class="focus">そのものが条件式</span>だよ!だから <span class="focus">==</span> がなくても使える ![](https://i.imgur.com/C7lBNDi.png) :::success ## 【課題4】 ブロックを調べる <レベル1> ::: ### <span class="focus">turtle.detect()命令</span>を使って目の前のブロックを調べて、trueの時は「<span class="focus">arimasu</span>」と表示しよう! ![](https://i.imgur.com/Mti7bIe.png) :::success ## 【課題5】 ブロックを調べる <レベル2> ::: ### 課題3を改良して、目の前のブロックがない時は「<span class="focus">arimasen</span>」と表示しよう ![](https://i.imgur.com/KkCyTxR.png) :::success ## 【課題6】 ブロックをよけて進む ::: ### ブロックがあるときは左か右によけてすすんで、ないときはまっすぐ進むプログラムを書こう! ![](https://i.imgur.com/qZAwF0C.png) ## ◆ ブロックをよけたかな? ### 課題6では1マスのブロックはよけることができる ### でも2マスのブロックはできない ![](https://i.imgur.com/IYXoQFc.png) :::success ## 【課題7】 もっとよける ::: ### ブロックを2マスまでよけるように、課題6を改良しよう ![](https://i.imgur.com/saOpPQh.png) <div class="link-box"> <a href="#" class="link prev">前に戻る</a> <a href="https://hackmd.io/CU6upwk_QROe_4P1EncGwA" class="link next">次に進む</a> </div>

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