JavaScript Program to Check Prime Number Example
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Now let's see example of how to check prime number example. We will use how to check prime number in javascript. This is a short guide on check prime number. Let's get started with how to check prime number in javascript.
Here i will give you many example how you can check prime number javascript.
Example : 1
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript Program to Check Prime Number Example - MyWebtuts.com</title>
</head>
<body>
<h2>JavaScript Program to Check Prime Number Example - MyWebtuts.com</h2>
<script type="text/javascript">
const num = parseInt(prompt("Enter a positive Number: "));
let isPrime = true;
if (num === 1) {
document.write("1 is neither Prime nor composite Number.");
}
else if (num > 1) {
for (let i = 2; i < num; i++) {
if (num % i == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
document.write(`${num} is a Prime Number`);
} else {
document.write(`${num} is not a Prime Number`);
}
}
else {
document.write("The Number is not a Prime Number.");
}
</script>
</body>
</html>
Output :
Example : 2
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript Program to Check Prime Number Example - MyWebtuts.com</title>
</head>
<body>
<h3>JavaScript Program to Check Prime Number Example - MyWebtuts.com</h3>
<form name="myform">
Enter the number:
<input type="text" name=n value="">
<br><br>
<input type="button" value="Check" onClick="test()">
<br>
</form>
<script type="text/javascript">
function test() {
var n, i, flag = true;
n = document.myform.n.value;
n = parseInt(n)
for(i = 2; i <= n - 1; i++)
if (n % i == 0) {
flag = false;
break;
}
if (flag == true)
alert(n + " is Prime Number");
else
alert(n + " is not Prime Number");
}
</script>
</body>
</html>
Output :
It will help you...