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  90 <span id="id1"></span><h1>制御構造 - 第二形式<a class="headerlink" href="#index-0" title="このヘッドラインへのパーマリンク">¶</a></h1>
  91 <p>第二形式による制御構造の用法を学びます。</p>
  92 <div class="section" id="index-1">
  93 <span id="id2"></span><h2>分岐処理<a class="headerlink" href="#index-1" title="このヘッドラインへのパーマリンク">¶</a></h2>
  94 <ul class="simple" id="index-2">
  95 <li>If ステートメント</li>
  96 </ul>
  97 <p>文法:</p>
  98 <div class="highlight-ring"><div class="highlight"><pre>if 式
  99         ステートメント・ブロック
 100 elseif 式
 101         ステートメント・ブロック
 102 else
 103         ステートメント・ブロック
 104 end
 105 </pre></div>
 106 </div>
 107 <p>用例:</p>
 108 <div class="highlight-ring"><div class="highlight"><pre><span class="k">put</span> <span class="s">&quot;</span>
 109         <span class="n">Main</span> <span class="n">Menu</span>
 110         <span class="o">---------</span>
 111         <span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="n">Say</span> <span class="n">Hello</span>
 112         <span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="n">About</span>
 113         <span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="k">Exit</span>
 114
 115     <span class="s">&quot; get nOption</span>
 116
 117 <span class="k">if</span> <span class="n">nOption</span> <span class="o">=</span> <span class="mi">1</span>  <span class="k">put</span> <span class="s">&quot;Enter your name : &quot;</span> <span class="k">get</span> <span class="n">name</span> <span class="k">put</span> <span class="s">&quot;Hello &quot;</span> <span class="o">+</span> <span class="n">name</span> <span class="o">+</span> <span class="n">nl</span>
 118 <span class="k">elseif</span> <span class="n">nOption</span> <span class="o">=</span> <span class="mi">2</span> <span class="k">put</span> <span class="s">&quot;Sample : using if statement&quot;</span> <span class="o">+</span> <span class="n">nl</span>
 119 <span class="k">elseif</span> <span class="n">nOption</span> <span class="o">=</span> <span class="mi">3</span> <span class="k">bye</span>
 120 <span class="k">else</span> <span class="k">put</span> <span class="s">&quot;bad option...&quot;</span> <span class="o">+</span> <span class="n">nl</span>
 121 <span class="k">end</span>
 122 </pre></div>
 123 </div>
 124 <ul class="simple" id="index-3">
 125 <li>Switch ステートメント</li>
 126 </ul>
 127 <p>文法:</p>
 128 <div class="highlight-ring"><div class="highlight"><pre>switch 式
 129 case 式
 130         ステートメント・ブロック
 131 else
 132         ステートメント・ブロック
 133 end
 134 </pre></div>
 135 </div>
 136 <p>用例:</p>
 137 <div class="highlight-ring"><div class="highlight"><pre><span class="k">Put</span> <span class="s">&quot;</span>
 138         <span class="n">Main</span> <span class="n">Menu</span>
 139         <span class="o">---------</span>
 140         <span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="n">Say</span> <span class="n">Hello</span>
 141         <span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="n">About</span>
 142         <span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="k">Exit</span>
 143
 144     <span class="s">&quot; Get nOption</span>
 145
 146 <span class="k">Switch</span> <span class="n">nOption</span>
 147 <span class="k">Case</span> <span class="mi">1</span> <span class="k">Put</span> <span class="s">&quot;Enter your name : &quot;</span> <span class="k">Get</span> <span class="n">name</span> <span class="k">Put</span> <span class="s">&quot;Hello &quot;</span> <span class="o">+</span> <span class="n">name</span> <span class="o">+</span> <span class="n">nl</span>
 148 <span class="k">Case</span> <span class="mi">2</span> <span class="k">Put</span> <span class="s">&quot;Sample : using switch statement&quot;</span> <span class="o">+</span> <span class="n">nl</span>
 149 <span class="k">Case</span> <span class="mi">3</span> <span class="k">Bye</span>
 150 <span class="k">Else</span> <span class="k">Put</span> <span class="s">&quot;bad option...&quot;</span> <span class="o">+</span> <span class="n">nl</span>
 151 <span class="k">End</span>
 152 </pre></div>
 153 </div>
 154 </div>
 155 <div class="section" id="index-4">
 156 <span id="id3"></span><h2>ループ処理<a class="headerlink" href="#index-4" title="このヘッドラインへのパーマリンク">¶</a></h2>
 157 <ul class="simple">
 158 <li>While ループ</li>
 159 </ul>
 160 <p>文法:</p>
 161 <div class="highlight-ring"><div class="highlight"><pre>while 式
 162         ステートメント・ブロック
 163 end
 164 </pre></div>
 165 </div>
 166 <p>用例:</p>
 167 <div class="highlight-ring"><div class="highlight"><pre><span class="k">While</span> <span class="kp">True</span>
 168
 169         <span class="k">Put</span> <span class="s">&quot;</span>
 170                 <span class="n">Main</span> <span class="n">Menu</span>
 171                 <span class="o">---------</span>
 172                 <span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="n">Say</span> <span class="n">Hello</span>
 173                 <span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="n">About</span>
 174                 <span class="p">(</span><span class="mi">3</span><span class="p">)</span> <span class="k">Exit</span>
 175
 176             <span class="s">&quot; Get nOption</span>
 177
 178         <span class="k">Switch</span> <span class="n">nOption</span>
 179         <span class="k">Case</span> <span class="mi">1</span>
 180                 <span class="k">Put</span> <span class="s">&quot;Enter your name : &quot;</span>
 181                 <span class="k">Get</span> <span class="n">name</span>
 182                 <span class="k">Put</span> <span class="s">&quot;Hello &quot;</span> <span class="o">+</span> <span class="n">name</span> <span class="o">+</span> <span class="n">nl</span>
 183         <span class="k">Case</span> <span class="mi">2</span>
 184                 <span class="k">Put</span> <span class="s">&quot;Sample : using while loop&quot;</span> <span class="o">+</span> <span class="n">nl</span>
 185         <span class="k">Case</span> <span class="mi">3</span>
 186                 <span class="k">Bye</span>
 187         <span class="k">Else</span>
 188                 <span class="k">Put</span> <span class="s">&quot;bad option...&quot;</span> <span class="o">+</span> <span class="n">nl</span>
 189         <span class="k">End</span>
 190 <span class="k">End</span>
 191 </pre></div>
 192 </div>
 193 <ul class="simple" id="index-5">
 194 <li>For ループ</li>
 195 </ul>
 196 <p>文法:</p>
 197 <div class="highlight-ring"><div class="highlight"><pre>for 識別子=式 to 式 [step 式]
 198         ステートメント・ブロック
 199 end
 200 </pre></div>
 201 </div>
 202 <p>用例:</p>
 203 <div class="highlight-ring"><div class="highlight"><pre><span class="c"># 1 ～ 10 までの数値を表示します。</span>
 204 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">1</span> <span class="k">to</span> <span class="mi">10</span>  <span class="k">put</span> <span class="n">x</span> <span class="o">+</span> <span class="n">nl</span>  <span class="k">end</span>
 205 </pre></div>
 206 </div>
 207 <p>用例:</p>
 208 <div class="highlight-ring"><div class="highlight"><pre><span class="c"># 動的ループ</span>
 209 <span class="k">Put</span> <span class="s">&quot;Start : &quot;</span> <span class="k">get</span> <span class="n">nStart</span>
 210 <span class="k">Put</span> <span class="s">&quot;End   : &quot;</span> <span class="k">get</span> <span class="n">nEnd</span>
 211 <span class="k">Put</span> <span class="s">&quot;Step  : &quot;</span> <span class="k">get</span> <span class="n">nStep</span>
 212 <span class="k">For</span> <span class="n">x</span> <span class="o">=</span> <span class="n">nStart</span> <span class="k">to</span> <span class="n">nEnd</span> <span class="k">Step</span> <span class="n">nStep</span>
 213         <span class="k">Put</span> <span class="n">x</span> <span class="o">+</span> <span class="n">nl</span>
 214 <span class="k">End</span>
 215 </pre></div>
 216 </div>
 217 <p>用例:</p>
 218 <div class="highlight-ring"><div class="highlight"><pre><span class="c"># 0 ～ 10 までの偶数値を表示します。</span>
 219 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">0</span> <span class="k">to</span> <span class="mi">10</span> <span class="k">step</span> <span class="mi">2</span>
 220         <span class="k">Put</span> <span class="n">x</span> <span class="o">+</span> <span class="n">nl</span>
 221 <span class="k">end</span>
 222 </pre></div>
 223 </div>
 224 <p>用例:</p>
 225 <div class="highlight-ring"><div class="highlight"><pre><span class="c"># 10 ～ 0 までの偶数値を表示します。</span>
 226 <span class="k">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">10</span> <span class="k">to</span> <span class="mi">0</span> <span class="k">step</span> <span class="o">-</span><span class="mi">2</span>
 227         <span class="k">put</span> <span class="n">x</span> <span class="o">+</span> <span class="n">nl</span>
 228 <span class="k">end</span>
 229 </pre></div>
 230 </div>
 231 <ul class="simple" id="index-6">
 232 <li>For in ループ</li>
 233 </ul>
 234 <p>文法:</p>
 235 <div class="highlight-ring"><div class="highlight"><pre>for 識別子 in リストまたは文字列  [step 式]
 236         ステートメント・ブロック
 237 end
 238 </pre></div>
 239 </div>
 240 <p>用例:</p>
 241 <div class="highlight-ring"><div class="highlight"><pre><span class="n">aList</span> <span class="o">=</span> <span class="mi">1</span><span class="p">:</span><span class="mi">10</span>    <span class="c"># 1 ～ 10 までの数値を有するリストを作成します。</span>
 242 <span class="k">for</span> <span class="n">x</span> <span class="k">in</span> <span class="n">aList</span>  <span class="k">put</span> <span class="n">x</span> <span class="o">+</span> <span class="n">nl</span>  <span class="k">end</span> <span class="c"># 1 ～ 10 までの数値を表示します。</span>
 243 </pre></div>
 244 </div>
 245 </div>
 246 <div class="section" id="index-7">
 247 <span id="id4"></span><h2>例外処理<a class="headerlink" href="#index-7" title="このヘッドラインへのパーマリンク">¶</a></h2>
 248 <div class="highlight-ring"><div class="highlight"><pre>try
 249         ステートメント・ブロック
 250 catch
 251         ステートメント・ブロック
 252 end
 253 </pre></div>
 254 </div>
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 257
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 264 <ul>
 265 <li><a class="reference internal" href="#">制御構造 - 第二形式</a><ul>
 266 <li><a class="reference internal" href="#index-1">分岐処理</a></li>
 267 <li><a class="reference internal" href="#index-4">ループ処理</a></li>
 268 <li><a class="reference internal" href="#index-7">例外処理</a></li>
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