This section provides a JavaScript tutorial example showing how to write a 'while' loop statement.
To help you understand how "while" loop statements work, I wrote the following the JavaScript tutorial example,
For_Loop_Statements.html:
<html>
<!-- While_Loop_Statements.html
Copyright (c) 2008 by Dr. Herong Yang, http://www.herongyang.com/
-->
<head><title>While Loop Statements</title></head>
<body>
<pre>
<script type="text/javascript">
var i, j, is_prime;
i = 3;
while ( i<=30 ) {
is_prime = true;
j = 2;
while ( j<=i/2 ) {
is_prime = i%j > 0;
if (!is_prime) break;
j++;
}
if (is_prime)
document.write("Found a prime number: " + i + ".\n");
i += 2;
}
</script>
</pre>
</body>
</html>
This JavaScript uses a nested "while" loop statements to calculate prime numbers.
It has the same execution logic as the While_Loop_Statements.html JavaScript.
The output of this sample JavaScript is:
Found a prime number: 3.
Found a prime number: 5.
Found a prime number: 7.
Found a prime number: 11.
Found a prime number: 13.
Found a prime number: 17.
Found a prime number: 19.
Found a prime number: 23.
Found a prime number: 29.
