De seneste forum tråde i [double] på Udvikleren.dk http://www.udvikleren.dk/ Wed, 29 Apr 2026 04:15:27 GMT http://backend.userland.com/rss Udvikleren.dk RSS Feeder 60 Hej Udviklere!<br />Jeg er igang med at læse bogen Objektorienteret programmering i Java(4. udgave). I denne bog får man løbende opgaver hvor man skal skrive små programmer. Er nået til en opgave der lyder: "Lav et vekselprogram fra dollar til euro. Det skal påregne en kommission på 2%, dog mindst 0.5 euro." Det lyder jo simpelt nok, men er stødt ind i den der kommission. Min kode indtil videre er:<br /><div class="codeboxheader" id="code_1092189031" onclick="ToggleCodeBox(this.id);"><img id="code_1092189031_arrow" src="/images/icons/codeboxarrow_down.gif" alt="Fold kodeboks ind/ud" title="Fold kodeboks ind/ud" />Java kode&nbsp;</div><pre id="code_1092189031code" style="border-top: 0px; display: none;"><ol><li style="padding: 0; margin: 0;"> <span style="color: #0000FF;">import</span><span style="color: #000000;"> javax.swing.</span><span style="color: #000000;">*</span><span style="color: #000000;">; </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"></span><span style="color: #0000FF;">import</span><span style="color: #000000;"> java.util.</span><span style="color: #000000;">*</span><span style="color: #000000;">; </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"></span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">class</span><span style="color: #000000;"> USDToEUR2NotDone </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;">{ </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> main(String[] arg) </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> { </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> String inputBel&#248;b </span><span style="color: #000000;">=</span><span style="color: #000000;"> JOptionPane.showInputDialog(</span><span style="color: #000000;">&quot;</span><span style="color: #000000;">Indtast bel&#248;b i USD</span><span style="color: #000000;">&quot;</span><span style="color: #000000;">); </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> </span><span style="color: #0000FF;">double</span><span style="color: #000000;"> USD </span><span style="color: #000000;">=</span><span style="color: #000000;"> Double.parseDouble(inputBel&#248;b); </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> </span><span style="color: #0000FF;">double</span><span style="color: #000000;"> kurs </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #000000;">0.689655172</span><span style="color: #000000;">; </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> </span><span style="color: #0000FF;">double</span><span style="color: #000000;"> bel&#248;b </span><span style="color: #000000;">=</span><span style="color: #000000;"> USD </span><span style="color: #000000;">*</span><span style="color: #000000;"> kurs; </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> </span><span style="color: #0000FF;">double</span><span style="color: #000000;"> kommision </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #000000;">0.02</span><span style="color: #000000;">; </span></li><li style="padding: 0; margin: 0;"> <span style="color: #000000;"> </span><span style="color: #0000FF;">double</span><span style="color: #000000;"> efterKommision </span><span style="color: #000000;">=</span><span style="color: #000000;"> bel&#248;b </span><span style="color: #000000;">*</span><span style="color: #000000;"> kommision;</span></li></ol></pre><br />Det passer sådan set fint nok. MEN! Opgaven siger "dog mindst 0,5 euro". Helt ærlig har jeg ingen forstand på hvordan jeg siger noget der ligner:<br />Hvis kommissionen &lt;=4.99, så + den manglende værdi indtil kommissionen rammer 0,5...<br />Hvad hedder det i Java?<br /><br />Tobias Jessen http://www.udvikleren.dk/forum/34761/lille-hurtig-i-java/ Thu, 30 Jun 2011 20:29:29 GMT