Hi everyone! I'm new to this forum and I hope I can be useful to this community now that I'm learning Javascript
I have a problem with a Javascript function. It's a simple script to check if a number is a prime number or not. I know there's already lots of this examples on the Internet but I didn't wanted to check them only to see if I could do it on my own.
So, here's my script. It's works just fine, but for some reason, when I write 33, the script says it is a prime number, when it's not. Any ideas?
//Prime number checker
//@rodochoa
var i =parseInt(prompt("Write a number"));
isPrime(i);
function isPrime(num){
if(num === 1 || num ===2 || num===3){
//If the input is 1,2,3 it prints directly without checking
console.log(num + " is a prime number");
}
else{
for(i=2;i<num;i++){
if(num%i===0){
console.log(num + " is not a prime number");
break;
}
else{
console.log(num + " is a prime number");
break;
}
}
<html>
<head>
<title>asal sayı</title>
<meta content="text/html; charset=UTF-8" http-equiv="content-type">
<LINK href="stil.css" type=text/css rel=stylesheet>
</head>
<body>
<form name="form1">
<table style=" text-align: left; width: 493px; height: 110px;" >
<tr><td><p>Aşağıdaki kutucuğa 50000'den küçük bir sayı yazıp kutucuk dışında bir yere tıklayın.1'den yazdığınız sayıya kadar olan asal sayılar bulunacaktır. Büyük sayılar yazmanız halinde internet tarayıcınız kilitlenebilir. Yazık ona da.</p></td></tr>
<tr><td><textarea cols="6" rows="1" name="son" onChange="rast()" size="4">100</textarea><a id="bekle">-</a>
</td></tr>
<tr><td><textarea name="kutu" rows="13" cols="50" style="font-size:14; color:blue;">10</textarea></td></tr>
</table>
</form>
<script type="text/javascript">
var en=50000,tt,t,ad=0
asal=new Array(2,3,5,7,11,13)
function rast(){
if (document.form1.son.value >en){alert(en + " den büyük sayı yazmayın !!!")}
if (document.form1.son.value <= en){bekle.innerHTML=" Hesaplanyor, lütfen bekleyin !"; setTimeout("rast2()",100)
}
}
function rast2(){
var ns=document.form1.son.value/2, n=5, m="2"
for(i=7;i<=ns;i++){
t=2*i + 1;tt=1;ad=0
nnn=Math.pow(t,0.5)
nnn=(Math.round(nnn))
if(nnn<=5)nnn=5
for(j=1;asal[j]<=nnn;j++){tt=t%asal[j];if (tt==0)ad=1}
if (ad==0){n++;asal[n]=t}
}
for(k=1; k<=n;k++)m=m+", "+ asal[k]
document.form1.kutu.value=m +"-------" +(n*1+1)+ " tane"
bekle.innerHTML=" Bitti !"
}
rast();
</script>
</body>
</html>
The Time Through Ages
In the Name of Allah, Most Gracious, Most Merciful
1. By the Time,
2. Verily Man is in loss,
3. Except such as have Faith, and do righteous deeds, and (join together) in the mutual enjoining of Truth, and of Patience and Constancy.
Problem with a script to check prime numbers.
And greetings from Mexico.
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