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This is the code I have so far, which gives me the button but I continue to have problems with getting the ten alert messages to come up.
<html>
<head>
<script type="text/javascript">
<!--
var primeString=''
var primeCount=0
function checkprime(){
while (primeCount<=10){
var isprime=1
for (j=2; j<=Math.sqrt(i); j++)
{
if(i%j)==0)
{
isprime=0
}
}
primeCount=(isprime==1?primecount=1:primecount)
if (isprime==1){primeString=primeString=i}
i=i=1}
}
document.write(primeString)
}
//-->
</script>
</head>
<body>
<h2>The First Ten Prime Numbers</h2>
<h3>Click to find the first ten prime numbers</h3>
<form name="PrimeNumbers">
<input name="btnprompt"
id="btnprompt"
type="submit"
value="Find Primes"
onClick="Display_Prime()">
</form>
</body>
</html>
Thanks in advance!
However, having 10 alerts that you have to click and close (for each one) is VERY annoying.
I agree about the 10 alerts, but it is what was requested.
This is where I'm at....
<html>
<head>
<script type="text/javascript">
<!--
var primeString=''
var primeCount=0
function checkprime(){
var i=1
while (primeCount<=10){
var isprime=1
for (j=2; j<=Math.sqrt(i); j++)
{
if(i%j==0)
{
isprime=0
}
}
primeCount=(isprime==1?primecount=1:primecount)
if (isprime==1){primeString=primeString+i}
i=i+1
}
function display_prime(){
alert(primeString);
}
</script>
</head>
<body onload="checkprime()">
<h2>The First Ten Prime Numbers</h2>
<h3>Click to find the first ten prime numbers</h3>
<input type="button"
name="btnDo"
id="btnDo"
value="Find Prime"
onClick="display_prime()">
</body>
</html>
This still doesn't work....any help?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<!--
Note the strict DOCTYPE. It's good practice to use a complete DOCTYPE to
put browsers in standards compliant mode (vs. quirks mode).
-->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" >
<title>Untitled</title>
</head>
<body>
<h2>The First Ten Prime Numbers</h2>
<h3>Click to find the first ten prime numbers</h3>
<form action="">
<div>
<!-- forms can only contain block elements, so this is wrapped in a div -->
<input type="button" id="btnDo" value="Find Prime">
</div>
</form>
<!--
Note, there are no HTML comments in my script elements. They are not
needed and haven't been since Netscape 1. Also note that I am attaching my
event handlers in the script instead of in my markup... unobtrusive. :)
-->
<script type="text/javascript">
window.onload = function() {
// Attach listener to button
var btnDo = document.getElementById('btnDo');
/**
* Check a number to see if it is prime. Returns false for numbers less
* than 2.
* @param {Integer} n The number to check
* @return true if the number is divisible by only itself an 1, otherwise false
*/
function isPrime(n) {
var i;
if (n < 2) { // 1, 0, and negative numbers are not prime.
return false;
}
for (i = n - 1; i > 0; i--) {
if (i == 1) {
return true;
}
if (n % i == 0) {
return false;
}
}
}
btnDo.onclick = function() {
// Get the first 10 prime numbers starting at 2. Adjust n to start
// higher.
var n, nPrime = [];
for (n = 2; nPrime.length < 10; n++) {
if (isPrime(n)) {
nPrime[nPrime.length] = n;
}
}
// nPrime is now an array of 10 prime numbers
alert('Prime Numbers:\n' + nPrime.join(", "));
}
};
</script>
</body>
</html>
Your code give me one alert message with the first ten prime numbers in. How could the code be adjusted to print each of the first ten prime numbers in ten separate alert messages. Opening one after the other?
btnDo.onclick = function() {
// Get the first 10 prime numbers starting at 2. Adjust n to start
// higher.
var n, nPrime = [];
for (n = 2; nPrime.length < 10; n++) {
if (isPrime(n)) {
nPrime[nPrime.length] = n;
alert('Prime Number:\n' + n);
}
}
// nPrime is now an array of 10 prime numbers
// alert('Prime Numbers:\n' + nPrime.join(", "));
}
Your code descriptions were very helpful!
well, all the primes except 2 itself
you know what I mean
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