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<section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="doccomment">/// Get the number of qubits needed to represent a number.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivilent to ceil(log2(n))s</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_width</span>(<span class="ident">n</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="ident">i32</span> {
((<span class="ident">n</span> <span class="kw">as</span> <span class="ident">f32</span>) <span class="op">+</span> <span class="number">1.0</span>).<span class="ident">log2</span>().<span class="ident">ceil</span>() <span class="kw">as</span> <span class="ident">i32</span>
}
<span class="doccomment">/// Calculate the greatest common divisor (Euclid's algorithm)</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">gcd</span>(<span class="kw-2">mut</span> <span class="ident">a</span>: <span class="ident">i32</span>, <span class="kw-2">mut</span> <span class="ident">b</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="ident">i32</span> {
<span class="kw">while</span> <span class="ident">b</span> <span class="op">!=</span> <span class="number">0</span> {
<span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">a</span>;
<span class="ident">a</span> <span class="op">=</span> <span class="ident">b</span>;
<span class="ident">b</span> <span class="op">=</span> <span class="ident">tmp</span> <span class="op">%</span> <span class="ident">b</span>;
}
<span class="ident">a</span>
}
</pre>
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