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  <title>Qt 4.8: calculator.js Example File (demos/declarative/calculator/qml/calculator/CalculatorCore/calculator.js)</title>
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<h1 class="title">calculator.js Example File</h1>
<span class="small-subtitle">demos/declarative/calculator/qml/calculator/CalculatorCore/calculator.js</span>
<!-- $$$demos/declarative/calculator/qml/calculator/CalculatorCore/calculator.js-description -->
<div class="descr"> <a name="details"></a>
<pre class="js"> var <span class="name">curVal</span> = <span class="number">0</span>
 var <span class="name">memory</span> = <span class="number">0</span>
 var <span class="name">lastOp</span> = <span class="string">&quot;&quot;</span>
 var <span class="name">timer</span> = <span class="number">0</span>

 <span class="keyword">function</span> <span class="name">disabled</span>(<span class="name">op</span>) {
     <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;.&quot;</span> <span class="operator">&amp;&amp;</span> <span class="name">display</span>.<span class="name">text</span>.<span class="name">toString</span>().<span class="name">search</span>(/\./) <span class="operator">!=</span> -<span class="number">1</span>) {
         <span class="keyword">return</span> <span class="number">true</span>
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="name">squareRoot</span> <span class="operator">&amp;&amp;</span>  <span class="name">display</span>.<span class="name">text</span>.<span class="name">toString</span>().<span class="name">search</span>(/-/) <span class="operator">!=</span> -<span class="number">1</span>) {
         <span class="keyword">return</span> <span class="number">true</span>
     } else {
         <span class="keyword">return</span> <span class="number">false</span>
     }
 }

 <span class="keyword">function</span> <span class="name">doOperation</span>(<span class="name">op</span>) {
     <span class="keyword">if</span> (<span class="name">disabled</span>(<span class="name">op</span>)) {
         <span class="keyword">return</span>
     }

     <span class="keyword">if</span> (<span class="name">op</span>.<span class="name">toString</span>().<span class="name">length</span><span class="operator">==</span><span class="number">1</span> <span class="operator">&amp;&amp;</span> ((<span class="name">op</span> <span class="operator">&gt;=</span> <span class="string">&quot;0&quot;</span> <span class="operator">&amp;&amp;</span> <span class="name">op</span> <span class="operator">&lt;=</span> <span class="string">&quot;9&quot;</span>) <span class="operator">||</span> <span class="name">op</span><span class="operator">==</span><span class="string">&quot;.&quot;</span>) ) {
         <span class="keyword">if</span> (<span class="name">display</span>.<span class="name">text</span>.<span class="name">toString</span>().<span class="name">length</span> <span class="operator">&gt;=</span> <span class="number">14</span>)
             <span class="keyword">return</span>; <span class="comment">// No arbitrary length numbers</span>
         <span class="keyword">if</span> (<span class="name">lastOp</span>.<span class="name">toString</span>().<span class="name">length</span> <span class="operator">==</span> <span class="number">1</span> <span class="operator">&amp;&amp;</span> ((<span class="name">lastOp</span> <span class="operator">&gt;=</span> <span class="string">&quot;0&quot;</span> <span class="operator">&amp;&amp;</span> <span class="name">lastOp</span> <span class="operator">&lt;=</span> <span class="string">&quot;9&quot;</span>) <span class="operator">||</span> <span class="name">lastOp</span> <span class="operator">==</span> <span class="string">&quot;.&quot;</span>) ) {
             <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">display</span>.<span class="name">text</span> <span class="operator">+</span> <span class="name">op</span>.<span class="name">toString</span>()
         } else {
             <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">op</span>
         }
         <span class="name">lastOp</span> <span class="operator">=</span> <span class="name">op</span>
         <span class="keyword">return</span>
     }
     <span class="name">lastOp</span> <span class="operator">=</span> <span class="name">op</span>

     <span class="keyword">if</span> (<span class="name">display</span>.<span class="name">currentOperation</span>.<span class="name">text</span> <span class="operator">==</span> <span class="string">&quot;+&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>()) <span class="operator">+</span> <span class="name">Number</span>(<span class="name">curVal</span>.<span class="name">valueOf</span>())
     } else <span class="keyword">if</span> (<span class="name">display</span>.<span class="name">currentOperation</span>.<span class="name">text</span> <span class="operator">==</span> <span class="string">&quot;-&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">curVal</span>) <span class="operator">-</span> <span class="name">Number</span>(<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>())
     } else <span class="keyword">if</span> (<span class="name">display</span>.<span class="name">currentOperation</span>.<span class="name">text</span> <span class="operator">==</span> <span class="name">multiplication</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">curVal</span>) <span class="operator">*</span> <span class="name">Number</span>(<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>())
     } else <span class="keyword">if</span> (<span class="name">display</span>.<span class="name">currentOperation</span>.<span class="name">text</span> <span class="operator">==</span> <span class="name">division</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">Number</span>(<span class="name">curVal</span>) <span class="operator">/</span> <span class="name">Number</span>(<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>())).<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">display</span>.<span class="name">currentOperation</span>.<span class="name">text</span> <span class="operator">==</span> <span class="string">&quot;=&quot;</span>) {
     }

     <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;+&quot;</span> <span class="operator">||</span> <span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;-&quot;</span> <span class="operator">||</span> <span class="name">op</span> <span class="operator">==</span> <span class="name">multiplication</span> <span class="operator">||</span> <span class="name">op</span> <span class="operator">==</span> <span class="name">division</span>) {
         <span class="name">display</span>.<span class="name">currentOperation</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">op</span>
         <span class="name">curVal</span> <span class="operator">=</span> <span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>()
         <span class="keyword">return</span>
     }

     <span class="name">curVal</span> <span class="operator">=</span> <span class="number">0</span>
     <span class="name">display</span>.<span class="name">currentOperation</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">&quot;&quot;</span>

     <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;1/x&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> (<span class="number">1</span> <span class="operator">/</span> <span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>()).<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;x^2&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> (<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>() <span class="operator">*</span> <span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>()).<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;Abs&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> (<span class="name">Math</span>.<span class="name">abs</span>(<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>())).<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;Int&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> (<span class="name">Math</span>.<span class="name">floor</span>(<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>())).<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="name">plusminus</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> (<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>() <span class="operator">*</span> -<span class="number">1</span>).<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="name">squareRoot</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> (<span class="name">Math</span>.<span class="name">sqrt</span>(<span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>())).<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;mc&quot;</span>) {
         <span class="name">memory</span> <span class="operator">=</span> <span class="number">0</span>;
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;m+&quot;</span>) {
         <span class="name">memory</span> <span class="operator">+=</span> <span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;mr&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">memory</span>.<span class="name">toString</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;m-&quot;</span>) {
         <span class="name">memory</span> <span class="operator">=</span> <span class="name">display</span>.<span class="name">text</span>.<span class="name">valueOf</span>()
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="name">leftArrow</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="name">display</span>.<span class="name">text</span>.<span class="name">toString</span>().<span class="name">slice</span>(<span class="number">0</span>, -<span class="number">1</span>)
         <span class="keyword">if</span> (<span class="name">display</span>.<span class="name">text</span>.<span class="name">length</span> <span class="operator">==</span> <span class="number">0</span>) {
             <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">&quot;0&quot;</span>
         }
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;Off&quot;</span>) {
         <span class="name">Qt</span>.<span class="name">quit</span>();
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;C&quot;</span>) {
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">&quot;0&quot;</span>
     } else <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">&quot;AC&quot;</span>) {
         <span class="name">curVal</span> <span class="operator">=</span> <span class="number">0</span>
         <span class="name">memory</span> <span class="operator">=</span> <span class="number">0</span>
         <span class="name">lastOp</span> <span class="operator">=</span> <span class="string">&quot;&quot;</span>
         <span class="name">display</span>.<span class="name">text</span> <span class="operator">=</span><span class="string">&quot;0&quot;</span>
     }
 }</pre>
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<!-- @@@demos/declarative/calculator/qml/calculator/CalculatorCore/calculator.js -->
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