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  89   <div class="section" id="eval">
  90 <span id="index-0"></span><h1>Eval() とデバッグ<a class="headerlink" href="#eval" title="このヘッドラインへのパーマリンク">¶</a></h1>
  91 <p>下記の用法を学びます。</p>
  92 <ul class="simple">
  93 <li>Try/Catch/Done によるエラー処理</li>
  94 <li>Eval() 関数</li>
  95 <li>Raise() 関数</li>
  96 <li>Assert() 関数</li>
  97 </ul>
  98 <div class="section" id="try-catch-done">
  99 <span id="index-1"></span><h2>Try/Catch/Done<a class="headerlink" href="#try-catch-done" title="このヘッドラインへのパーマリンク">¶</a></h2>
 100 <p>文法:</p>
 101 <div class="highlight-ring"><div class="highlight"><pre><span class="k">Try</span>
 102         <span class="n">ステートメント</span><span class="p">...</span>
 103 <span class="k">Catch</span>
 104         <span class="n">ステートメント</span><span class="p">...</span>
 105 <span class="k">Done</span>
 106 </pre></div>
 107 </div>
 108 <p>まず Try ブロックのステートメントが実行されます。
 109 そしてエラーが発生すると catch ブロックのステートメントが実行されます。</p>
 110 <p>catch ブロックの内側では変数 cCatchError でエラーメッセージを取得できます。</p>
 111 <p>用例:</p>
 112 <div class="highlight-ring"><div class="highlight"><pre><span class="k">Try</span>
 113         <span class="k">see</span> <span class="mi">5</span><span class="o">/</span><span class="mi">0</span>
 114 <span class="k">Catch</span>
 115         <span class="k">see</span> <span class="s">&quot;Catch!&quot;</span> <span class="o">+</span> <span class="n">nl</span> <span class="o">+</span> <span class="n">cCatchError</span>
 116 <span class="k">Done</span>
 117 </pre></div>
 118 </div>
 119 <p>実行結果:</p>
 120 <div class="highlight-ring"><div class="highlight"><pre><span class="k">Catch</span><span class="o">!</span>
 121 <span class="n">Error</span> <span class="p">(</span><span class="n">R1</span><span class="p">)</span> <span class="p">:</span> <span class="n">Cann</span><span class="sc">&#39;t divide by zero !</span>
 122 </pre></div>
 123 </div>
 124 </div>
 125 <div class="section" id="index-2">
 126 <span id="id1"></span><h2>Eval() 関数<a class="headerlink" href="#index-2" title="このヘッドラインへのパーマリンク">¶</a></h2>
 127 <p>Eval() 関数は実行時に文字列からコードを実行します。</p>
 128 <p>文法:</p>
 129 <div class="highlight-ring"><div class="highlight"><pre><span class="n">Eval</span><span class="p">(</span><span class="n">cCode</span><span class="p">)</span>
 130 </pre></div>
 131 </div>
 132 <p>用例:</p>
 133 <div class="highlight-ring"><div class="highlight"><pre><span class="n">Eval</span><span class="p">(</span><span class="s">&quot;nOutput = 5+2*5 &quot;</span> <span class="p">)</span>
 134 <span class="k">See</span> <span class="s">&quot;5+2*5 = &quot;</span> <span class="o">+</span> <span class="n">nOutput</span> <span class="o">+</span> <span class="n">nl</span>
 135 <span class="n">Eval</span><span class="p">(</span><span class="s">&quot;for x = 1 to 10 see x + nl next&quot;</span><span class="p">)</span>
 136 <span class="n">Eval</span><span class="p">(</span><span class="s">&quot;func test see &#39;message from test!&#39; &quot;</span><span class="p">)</span>
 137 <span class="n">test</span><span class="p">()</span>
 138 </pre></div>
 139 </div>
 140 <p>実行結果:</p>
 141 <div class="highlight-ring"><div class="highlight"><pre><span class="mi">5</span><span class="o">+</span><span class="mi">2</span><span class="o">*</span><span class="mi">5</span> <span class="o">=</span> <span class="mi">15</span>
 142 <span class="mi">1</span>
 143 <span class="mi">2</span>
 144 <span class="mi">3</span>
 145 <span class="mi">4</span>
 146 <span class="mi">5</span>
 147 <span class="mi">6</span>
 148 <span class="mi">7</span>
 149 <span class="mi">8</span>
 150 <span class="mi">9</span>
 151 <span class="mi">10</span>
 152 <span class="n">message</span> <span class="k">from</span> <span class="n">test</span><span class="o">!</span>
 153 </pre></div>
 154 </div>
 155 <p>Return 命令で値を返せます。</p>
 156 <p>用例:</p>
 157 <div class="highlight-ring"><div class="highlight"><pre><span class="k">see</span> <span class="n">Eval</span><span class="p">(</span><span class="s">&quot;return 5*5&quot;</span><span class="p">)</span>
 158 </pre></div>
 159 </div>
 160 <p>実行結果:</p>
 161 <div class="highlight-ring"><div class="highlight"><pre><span class="mi">25</span>
 162 </pre></div>
 163 </div>
 164 </div>
 165 <div class="section" id="raise">
 166 <span id="index-3"></span><h2>Raise() 関数<a class="headerlink" href="#raise" title="このヘッドラインへのパーマリンク">¶</a></h2>
 167 <p>Raise() 関数は例外を発生します。</p>
 168 <p>文法:</p>
 169 <div class="highlight-ring"><div class="highlight"><pre><span class="n">Raise</span><span class="p">(</span><span class="n">cErrorMessage</span><span class="p">)</span>
 170 </pre></div>
 171 </div>
 172 <p>この関数はエラーメッセージを表示した後にプログラムを終了します。</p>
 173 <p>raise() 関数で生成された例外は Try/Catch/Done により回避できます。</p>
 174 <p>用例:</p>
 175 <div class="highlight-ring"><div class="highlight"><pre><span class="n">nMode</span> <span class="o">=</span> <span class="mi">10</span>
 176
 177 <span class="k">if</span> <span class="n">nMode</span> <span class="o">&lt;</span> <span class="mi">0</span> <span class="ow">or</span> <span class="n">nMode</span> <span class="o">&gt;</span> <span class="mi">5</span>
 178         <span class="n">raise</span><span class="p">(</span><span class="s">&quot;Error : nMode not in the range 1:4&quot;</span><span class="p">)</span>
 179 <span class="k">ok</span>
 180 </pre></div>
 181 </div>
 182 <p>実行結果:</p>
 183 <div class="highlight-ring"><div class="highlight"><pre><span class="n">Line</span> <span class="mi">4</span> <span class="n">Error</span> <span class="p">:</span> <span class="n">nMode</span> <span class="ow">not</span> <span class="k">in</span> <span class="n">the</span> <span class="n">range</span> <span class="mi">1</span><span class="p">:</span><span class="mi">4</span>
 184 <span class="k">In</span> <span class="n">raise</span> <span class="k">in</span> <span class="n">file</span> <span class="n">tests</span><span class="o">\</span><span class="n">raise</span><span class="p">.</span><span class="n">ring</span>
 185 </pre></div>
 186 </div>
 187 <p>用例:</p>
 188 <div class="highlight-ring"><div class="highlight"><pre><span class="k">try</span>
 189         <span class="n">testmode</span><span class="p">(</span><span class="mi">6</span><span class="p">)</span>
 190 <span class="k">catch</span>
 191         <span class="k">see</span> <span class="s">&quot;avoid raise!&quot;</span>
 192 <span class="k">done</span>
 193
 194 <span class="n">testmode</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span>
 195
 196 <span class="k">func</span> <span class="n">testmode</span> <span class="n">nMode</span>
 197
 198         <span class="k">if</span> <span class="n">nMode</span> <span class="o">&lt;</span> <span class="mi">0</span> <span class="ow">or</span> <span class="n">nMode</span> <span class="o">&gt;</span> <span class="mi">5</span>
 199                 <span class="n">raise</span><span class="p">(</span><span class="s">&quot;Error : nMode not in the range 1:4&quot;</span><span class="p">)</span>
 200         <span class="k">ok</span>
 201 </pre></div>
 202 </div>
 203 <p>実行結果:</p>
 204 <div class="highlight-ring"><div class="highlight"><pre><span class="n">avoid</span> <span class="n">raise</span><span class="o">!</span>
 205 <span class="n">Line</span> <span class="mi">12</span> <span class="n">Error</span> <span class="p">:</span> <span class="n">nMode</span> <span class="ow">not</span> <span class="k">in</span> <span class="n">the</span> <span class="n">range</span> <span class="mi">1</span><span class="p">:</span><span class="mi">4</span>
 206 <span class="k">In</span> <span class="n">raise</span> <span class="k">In</span> <span class="n">function</span> <span class="n">testmode</span><span class="p">()</span> <span class="k">in</span> <span class="n">file</span> <span class="n">tests</span><span class="o">\</span><span class="n">raise2</span><span class="p">.</span><span class="n">ring</span>
 207 <span class="n">called</span> <span class="k">from</span> <span class="n">line</span> <span class="mi">7</span>  <span class="k">in</span> <span class="n">file</span> <span class="n">tests</span><span class="o">\</span><span class="n">raise2</span><span class="p">.</span><span class="n">ring</span>
 208 </pre></div>
 209 </div>
 210 </div>
 211 <div class="section" id="assert">
 212 <span id="index-4"></span><h2>Assert() 関数<a class="headerlink" href="#assert" title="このヘッドラインへのパーマリンク">¶</a></h2>
 213 <p>Assert() 関数はコードの実行前に条件をテストします。</p>
 214 <p>テストに失敗した場合は、アサートの条件を有するエラーメッセージを表示後にプログラムを終了します。</p>
 215 <p>文法:</p>
 216 <div class="highlight-ring"><div class="highlight"><pre><span class="n">Assert</span><span class="p">(</span> <span class="n">条件</span> <span class="p">)</span>
 217 </pre></div>
 218 </div>
 219 <p>用例:</p>
 220 <div class="highlight-ring"><div class="highlight"><pre><span class="n">x</span> <span class="o">=</span> <span class="mi">10</span>
 221 <span class="n">assert</span><span class="p">(</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">10</span><span class="p">)</span>
 222 <span class="n">assert</span><span class="p">(</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">100</span> <span class="p">)</span>
 223 </pre></div>
 224 </div>
 225 <p>実行結果:</p>
 226 <div class="highlight-ring"><div class="highlight"><pre><span class="n">Line</span> <span class="mi">3</span> <span class="n">Assertion</span> <span class="n">Failed</span><span class="o">!</span>
 227 <span class="k">In</span> <span class="n">assert</span> <span class="k">in</span> <span class="n">file</span> <span class="n">tests</span><span class="o">\</span><span class="n">assert</span><span class="p">.</span><span class="n">ring</span>
 228 </pre></div>
 229 </div>
 230 </div>
 231 </div>
 232
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 238         <div class="sphinxsidebarwrapper"><h3>ページの内容</h3>
 239 <ul>
 240 <li><a class="reference internal" href="#">Eval() とデバッグ</a><ul>
 241 <li><a class="reference internal" href="#try-catch-done">Try/Catch/Done</a></li>
 242 <li><a class="reference internal" href="#index-2">Eval() 関数</a></li>
 243 <li><a class="reference internal" href="#raise">Raise() 関数</a></li>
 244 <li><a class="reference internal" href="#assert">Assert() 関数</a></li>
 245 </ul>
 246 </li>
 247 </ul>
 248
 249
 250   <h4>前のトピックへ</h4>
 251   <p class="topless"><a href="systemfunc.html"
 252                         title="前の章へ">システム関数</a></p>
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