96 lines
1.6 KiB
HTML
96 lines
1.6 KiB
HTML
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<html>
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<head>
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<script language="JavaScript">
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<!--
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function primes(form)
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{
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today = new Date();
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sec = today.getTime();
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max = form.max.value;
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form.txt.value="";
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for(cnt=3; cnt<= max;cnt+=2)
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{
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sq = Math.round(Math.sqrt(cnt));
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isprime = true;
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for(i=3; i<=sq; i+=2)
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{
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if(cnt % i == 0)
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{
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isprime = false;
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break;
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}
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}
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if(isprime)
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{
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form.txt.value = form.txt.value + cnt + "\n";
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form.last.value = ""+cnt;
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delete today;
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today = new Date();
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t = Math.round((today.getTime()- sec)/1000);
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m=0;
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while(t >= 60)
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{
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m +=1;
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t -= 60;
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}
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if(t<10) {
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t = "" + "0"+t;
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}
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form.time.value = ""+m+":"+t ;
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}
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}
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return false;
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}
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//-->
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</script>
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</head>
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<body>
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<font face="arial"><b>Prime Number Finder</b> in Java Script<br>
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haplo@mindstab.net</font><br><br>
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<i><b>Warning:</b> JavaScript prime number finding process is very slow, and locks browser while working, so don't set maximum too high.</i><br><br>
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<form name="form">
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<table>
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<tr>
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<td valign="top">
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Maximum:<br>
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<input name="max" value="1000" size="10"><br>
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<input type="button" value="Calculate" onClick="primes(this.form)">
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</td>
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<td width="50">
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</td>
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<td valign="top">
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Time:<br>
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<input name="time" value="0:00" size="5">
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</td>
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</tr>
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<tr>
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<td height="50">
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</td></tr>
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<tr>
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<td>
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Primes:<br>
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<textarea name="txt" cols="15" rows="10"></textarea>
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</td>
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<td width="50">
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</td>
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<td valign="top">
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Last Prime Number:<br>
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<input name="last" value="0" size="15">
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</td>
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</tr>
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</table>
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</form>
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</body>
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</html>
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