JavaScript: Calculator Script - Prime Number Calculator

Main Calculator Script Prime Number Calculator

<!-- TWO STEPS TO INSTALL PRIME NUMBER CALCULATOR:

1.  Paste the coding into the HEAD of your HTML document

2.  Put the last code into the BODY of your HTML document  -->

<!-- Begin

function calculate(form) {

var num=parseInt(form.number.value);

if (isNaN(num) || num < 0) {

form.result.value=(form.number.value + " is not a valid number!  Try again!");

}

if (num == 1 || num == 2) {

form.result.value=(num + " is prime!");

}

for (var i=2;i<num;i++) {

if (num % i == 0) {

var prime="yes";

form.result.value=(num + " is not prime.  It is divisible by " + i + ".");

break;

}

if (num % i != 0) var prime="no";

}

if (prime == "no") form.result.value=(num + " is prime!");

}

// End -->

</SCRIPT>

</HEAD>

<h2>Prime Number Calculator</h2><p>

Please enter a number:<br>

<P>

</form>

</center>

<font face="arial, helvetica" size="-2">Free JavaScripts<br>

by <a href="http://script.omduena.com">Your Free JavaScript World</a></font>

</center><p>

Click Here if you need help to install the JavaScript

Free JavaScript Collection