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<title>"select case" Statement - TMBASIC</title>
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<div><div><a href="/" style="font-weight: 600;">TMBASIC</a><a href="doc.html"><span id="docLabelLong">Documentation</span><span id="docLabelShort">Docs</span></a><a href="https://github.com/tmbasic/tmbasic">GitHub</a></div></div>
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<div class="backlinks"><a href="doc.html">TMBASIC Documentation</a></div><h1><span class="tt">select case</span> Statement</h1><span class="tt">select case</span> is a code flow mechanism that allows you to choose one of several different code paths based on the value of a variable or expression.<div class="paragraphBreak"></div>A common use case is handling menu options.
The user enters a menu option, and the program executes the requested section of code.
A <span class="tt">select case</span> can be used to choose the correct code path based on the input.<h2>Syntax</h2><div class="code"><div>select case <INPUT></div><div><span class="indent"> </span>case <VALUE></div><div><span class="indent"> </span><span class="indent"> </span><STATEMENTS></div><div><span class="indent"> </span>case <VALUE>, <VALUE>, ...</div><div><span class="indent"> </span><span class="indent"> </span><STATEMENTS></div><div><span class="indent"> </span>case <VALUE> to <VALUE></div><div><span class="indent"> </span><span class="indent"> </span><STATEMENTS></div><div><span class="indent"> </span>case else</div><div><span class="indent"> </span><span class="indent"> </span><STATEMENTS></div><div>end select</div></div><ul><li><span class="tt"><INPUT></span> is the value used to determine which code path to take. Commonly, it is a <a href="type_number.html">Number</a>, but any type works.</li><li><span class="tt"><VALUE></span> is matched against <span class="tt"><INPUT></span>. If the value matches, then that code path is taken.</li><li><span class="tt"><STATEMENTS></span> is the code to execute if the value matches.</li></ul>If a <span class="tt">case else</span> block is provided, then it will be executed if no other <span class="tt">case</span> matches.<h2>Usage</h2>This example shows the flexibility of specifying case values.<div class="paragraphBreak"></div><div class="code"><div>for i = -1 to 6</div><div><span class="indent"> </span>select case i</div><div><span class="indent"> </span><span class="indent"> </span>case -1 to 1, 4 to 5</div><div><span class="indent"> </span><span class="indent"> </span><span class="indent"> </span>print i; <span class="string">": -1 to 1, 4 to 5"</span></div><div><span class="indent"> </span><span class="indent"> </span>case 2 to 3</div><div><span class="indent"> </span><span class="indent"> </span><span class="indent"> </span>print i; <span class="string">": 2 to 3"</span></div><div><span class="indent"> </span><span class="indent"> </span>case else</div><div><span class="indent"> </span><span class="indent"> </span><span class="indent"> </span>print i; <span class="string">": else"</span></div><div><span class="indent"> </span>end select</div><div>next</div></div>
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