Uncover the Secrets of Prime Numbers in JavaScript
What are Prime Numbers?
Prime numbers have fascinated mathematicians for centuries. A prime number is a positive integer that can only be divided by 1 and itself. For instance, the first few prime numbers are 2, 3, 5, 7, and 11. On the other hand, 4 is not a prime number because it can be divided by 1, 2, and 4 itself, making it a composite number.
Printing Prime Numbers with JavaScript
Let’s dive into a JavaScript program that prints prime numbers between a given range. The user is prompted to enter lower and higher bound numbers, and the program lists out all the prime numbers within that range.
The Code Behind the Magic
The program uses two nested for loops to achieve this. The first loop iterates between the numbers provided by the user, while the second loop checks each number to see if it’s prime. Here’s how it works:
- A variable
flagis set to 0, assuming the number is prime. - The second loop divides the number by each integer from 2 to one less than the number itself (
i - 1). - If the remainder of any division is 0, the
flagis set to 1, indicating that the number is not prime. - Finally, the program prints out all the numbers with a
flagvalue of 0, which are the prime numbers within the given range.
How it Works
To better understand this program, you should have a solid grasp of JavaScript concepts such as the if…else statement, for loops, and the break statement. By combining these fundamental building blocks, we can create a powerful program that uncovers the hidden patterns of prime numbers.
Take Your JavaScript Skills to the Next Level
With this program, you’ve taken the first step in exploring the fascinating world of prime numbers. Now, take your skills to the next level by experimenting with more advanced JavaScript concepts and pushing the boundaries of what’s possible.