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<title data-rh="true">3rd seminar | mf</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://blog.mfocko.xyz/c/bonuses/seminar-03/"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-c-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-c-current"><meta data-rh="true" property="og:title" content="3rd seminar | mf"><meta data-rh="true" name="description" content="Select sort implementation on arrays.
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<script>!function(){function t(t){document.documentElement.setAttribute("data-theme",t)}var e=function(){try{return new URLSearchParams(window.location.search).get("docusaurus-theme")}catch(t){}}()||function(){try{return localStorage.getItem("theme")}catch(t){}}();t(null!==e?e:"light")}(),function(){try{const c=new URLSearchParams(window.location.search).entries();for(var[t,e]of c)if(t.startsWith("docusaurus-data-")){var a=t.replace("docusaurus-data-","data-");document.documentElement.setAttribute(a,e)}}catch(t){}}()</script><div id="__docusaurus"><div role="region" aria-label="Skip to main content"><a class="skipToContent_fXgn" href="#__docusaurus_skipToContent_fallback">Skip to main content</a></div><nav aria-label="Main" class="navbar navbar--fixed-top"><div class="navbar__inner"><div class="navbar__items"><button aria-label="Toggle navigation bar" aria-expanded="false" class="navbar__toggle clean-btn" type="button"><svg width="30" height="30" viewBox="0 0 30 30" aria-hidden="true"><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></button><a class="navbar__brand" href="/"><b class="navbar__title text--truncate">mf</b></a><div class="navbar__item dropdown dropdown--hoverable"><a href="#" aria-haspopup="true" aria-expanded="false" role="button" class="navbar__link">Additional FI MU materials</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/algorithms/">Algorithms</a></li><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/c/">C</a></li><li><a class="dropdown__link" href="/cpp/">C++</a></li></ul></div><a class="navbar__item navbar__link" href="/contributions/">Contributions</a><a class="navbar__item navbar__link" href="/talks/">Talks</a></div><div class="navbar__items navbar__items--right"><a class="navbar__item navbar__link" href="/blog/">Blog</a><div class="toggle_vylO colorModeToggle_DEke"><button class="clean-btn toggleButton_gllP toggleButtonDisabled_aARS" type="button" disabled="" title="Switch between dark and light mode (currently light mode)" aria-label="Switch between dark and light mode (currently light mode)" aria-live="polite"><svg viewBox="0 0 24 24" width="24" height="24" class="lightToggleIcon_pyhR"><path fill="currentColor" d="M12,9c1.65,0,3,1.35,3,3s-1.35,3-3,3s-3-1.35-3-3S10.35,9,12,9 M12,7c-2.76,0-5,2.24-5,5s2.24,5,5,5s5-2.24,5-5 S14.76,7,12,7L12,7z M2,13l2,0c0.55,0,1-0.45,1-1s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S1.45,13,2,13z M20,13l2,0c0.55,0,1-0.45,1-1 s-0.45-1-1-1l-2,0c-0.55,0-1,0.45-1,1S19.45,13,20,13z M11,2v2c0,0.55,0.45,1,1,1s1-0.45,1-1V2c0-0.55-0.45-1-1-1S11,1.45,11,2z M11,20v2c0,0.55,0.45,1,1,1s1-0.45,1-1v-2c0-0.55-0.45-1-1-1C11.45,19,11,19.45,11,20z M5.99,4.58c-0.39-0.39-1.03-0.39-1.41,0 c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0s0.39-1.03,0-1.41L5.99,4.58z M18.36,16.95 c-0.39-0.39-1.03-0.39-1.41,0c-0.39,0.39-0.39,1.03,0,1.41l1.06,1.06c0.39,0.39,1.03,0.39,1.41,0c0.39-0.39,0.39-1.03,0-1.41 L18.36,16.95z M19.42,5.99c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06c-0.39,0.39-0.39,1.03,0,1.41 s1.03,0.39,1.41,0L19.42,5.99z M7.05,18.36c0.39-0.39,0.39-1.03,0-1.41c-0.39-0.39-1.03-0.39-1.41,0l-1.06,1.06 c-0.39,0.39-0.39,1.03,0,1.41s1.03,0.39,1.41,0L7.05,18.36z"></path></svg><svg viewBox="0 0 24 24" width="24" height="24" class="darkToggleIcon_wfgR"><path fill="currentColor" d="M9.37,5.51C9.19,6.15,9.1,6.82,9.1,7.5c0,4.08,3.32,7.4,7.4,7.4c0.68,0,1.35-0.09,1.99-0.27C17.45,17.19,14.93,19,12,19 c-3.86,0-7-3.14-7-7C5,9.07,6.81,6.55,9.37,5.51z M12,3c-4.97,0-9,4.03-9,9s4.03,9,9,9s9-4.03,9-9c0-0.46-0.04-0.92-0.1-1.36 c-0.98,1.37-2.58,2.26-4.4,2.26c-2.98,0-5.4-2.42-5.4-5.4c0-1.81,0.89-3.42,2.26-4.4C12.92,3.04,12.46,3,12,3L12,3z"></path></svg></button></div><div class="navbarSearchContainer_Bca1"><button type="button" class="DocSearch DocSearch-Button" aria-label="Search"><span class="DocSearch-Button-Container"><svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20"><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.
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<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_BuS1"><p>In case you have any questions, feel free to reach out either by email, Discord
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or just by submitting an issue <a href="https://gitlab.fi.muni.cz/xfocko/kb/-/issues/new" target="_blank" rel="noopener noreferrer">here</a>.</p></div></div>
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<p>This assignment has two versions. For the light version you can get 1.5 K₡. For
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the <em>full fat</em> 3 K₡. <strong>You can choose only one of them</strong>.</p>
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<p>To both of them you are given some basic tests. You can also have a look at the
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code used by the tests and use it to your advantage.</p>
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<p>Details can be found in the doxygen comments included in the source files.</p>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="light-version-main_lightc">Light version (<code>main_light.c</code>)<a href="#light-version-main_lightc" class="hash-link" aria-label="Direct link to light-version-main_lightc" title="Direct link to light-version-main_lightc"></a></h2>
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<p><a href="/files/c/bonuses/03/main_light.c" target="_blank" rel="noopener noreferrer">Source</a></p>
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<p>For the light version you have 3 functions to finish:</p>
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<ol>
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<li><code>swap</code> - that swaps two ints passed by pointers.</li>
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<li><code>maximum</code> - that returns index of the biggest <code>int</code> in the array.</li>
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<li><code>select_sort</code> - that sorts passed array using Select Sort.</li>
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</ol>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="full-fat-version-mainc">Full fat version (<code>main.c</code>)<a href="#full-fat-version-mainc" class="hash-link" aria-label="Direct link to full-fat-version-mainc" title="Direct link to full-fat-version-mainc"></a></h2>
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<p><a href="/files/c/bonuses/03/main.c" target="_blank" rel="noopener noreferrer">Source</a></p>
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<p>For the full fat version you have 4 functions to implement:</p>
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<ol>
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<li><code>swap</code> - that swaps two variables passed by pointers.</li>
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<li><code>maximum</code> - that returns index of the biggest element in the array using the
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comparator.</li>
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<li><code>select_sort</code> - that sorts passed array using Select Sort.</li>
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<li><code>int_comparator</code> - that is used for generic sort and maximum</li>
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</ol>
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<p>To 2nd and 3rd function you are given a pseudocode that you can use to implement
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it.</p>
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<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>Function pointers</div><div class="admonitionContent_BuS1"><p>In the skeleton of the “full fat” version you might have noticed a weird type
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signature of both the <code>maximum</code> and <code>select_sort</code> functions. Those functions get
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passed a <em>function pointer</em> to the comparator that you use for comparing the
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respective elements in the passed in array.</p><p>If we take the parameter from one of the functions from the skeleton:</p><div class="language-c codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-c codeBlock_bY9V thin-scrollbar" style="color:#000000;background-color:#ffffff"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token keyword" style="color:rgb(0, 0, 255)">int</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token operator" style="color:rgb(0, 0, 0)">*</span><span class="token plain">comp</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><span class="token punctuation" style="color:rgb(4, 81, 165)">(</span><span class="token keyword" style="color:rgb(0, 0, 255)">const</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">void</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">*</span><span class="token punctuation" style="color:rgb(4, 81, 165)">,</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">const</span><span class="token plain"> </span><span class="token keyword" style="color:rgb(0, 0, 255)">void</span><span class="token plain"> </span><span class="token operator" style="color:rgb(0, 0, 0)">*</span><span class="token punctuation" style="color:rgb(4, 81, 165)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p><code>comp</code> is a function pointer to a function that takes two pointers of unspecified
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type, i.e. pure address to the memory (you don't know what stored in there), and
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returns an <code>int</code>.</p><p>You can pass the function by simply using its name. (There is no need to use <code>&</code>
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to get its address.) And you can also call the function by “calling” the function
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pointer, e.g. <code>comp(left, right)</code>.</p></div></div>
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<h2 class="anchor anchorWithStickyNavbar_LWe7" id="submitting">Submitting<a href="#submitting" class="hash-link" aria-label="Direct link to Submitting" title="Direct link to Submitting"></a></h2>
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<p>For submitting the bonus assignment you can follow the same procedure as for
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submitting the homeworks, that is:</p>
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<ol>
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<li>On branch <code>main</code> add the provided skeleton.</li>
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<li>Checkout new branch <code>seminar-bonus-03</code>.</li>
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<li>Add your solution to the newly created branch.</li>
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<li>Create a MR to the <code>main</code> branch with me (<code>@xfocko</code>) as the reviewer.</li>
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</ol>
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<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>Directory structure for bonuses</div><div class="admonitionContent_BuS1"><p>Ideally create a directory <code>seminar-bonuses</code> in the root of your repository with
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bonuses in their own subdirectories.</p><p>Structure of your repository can look like this:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#000000;background-color:#ffffff"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token plain">.</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── bonuses</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">│ └── seminar-03</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── hello</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── hw01</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── hw02</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── seminar-01</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── seminar-02</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">└── seminar-03</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>or</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#000000;--prism-background-color:#ffffff"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar" style="color:#000000;background-color:#ffffff"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#000000"><span class="token plain">.</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── bonus-seminar-03</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── hello</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── hw01</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── hw02</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── seminar-01</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">├── seminar-02</span><br></span><span class="token-line" style="color:#000000"><span class="token plain">└── seminar-03</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Structure of the bonuses is entirely up to you, just keep it consistent.</p></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/mfocko/blog/tree/main/c/bonuses/03.md" target="_blank" rel="noopener noreferrer" class="theme-edit-this
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