Add example for calculator exercise

Author: Alexander Perry

index.html

@@ -318,6 +318,8 @@ <h1>Oppgave</h1>
 <li>Prøv med operatorene +, -, * og \</li>
 </ul>
 <p>Tips: Bruk if-setninger!</p>
+<div class="sourceCode"><pre class="sourceCode python"><code class="sourceCode python"><span class="op">&gt;&gt;&gt;</span> kalkulator(<span class="st">&quot;*&quot;</span>, <span class="dv">3</span>, <span class="dv">4</span>)
+<span class="dv">12</span></code></pre></div>
 </section></section>
 <section><section id="input-output" class="titleslide slide level1"><h1>Input / output</h1></section><section id="hva-er-input-output" class="slide level2">
 <h1>Hva er input / output?</h1>

index.md

@@ -308,6 +308,11 @@ def addition(tall1, tall2):
 
 Tips: Bruk if-setninger!
 
+```python
+>>> kalkulator("*", 3, 4)
+12
+```
+
 # Input / output
 
 ## Hva er input / output?