Prime Time

Prime Number Programs

As part of my project, I built 3 programs. All of these programs were made by me in Java, and I really enjoyed making them. Java is a free program, with lots of free documentation and help files available. This was my first time doing extensive programming, and I found Java easy to use. Another nice feature about Java is that it is platform independent, which means that I only have to write one program, and it will work on all computers (Windows, Linux, Macintosh), provided they have the necessary free software installed. Two of these programs I wrote work out of a DOS command line, and sadly I can't demonstrate them on this site. However, I will put up the code, a flowchart explaining the code, and a brief explanation of each. If you know about java, then you can compile this program, and run it from DOS. The third program I made is a visual program, that I will put up for download, and as long as you have the Java runtime software installed it should run. You simply imput a number, and it tells you whether or not it is prime.

The first program is called prime1. It tests a number for natural number divisors, and if any are found, it displays them, and tells you that the number is not prime. If no divisors are found, it tells you that the number is prime. Here's a flowchart-

Fraser, 2007.

The following is a screenshot of the prime1 program being run.

Fraser, 2007.

Click here to see the code for prime1, complete with line by line explanations.

The second program is called primefinder. It will find and list all of the primes between two set numbers, such as 2 and 10,000. It has to test each number for primality, and therefore it takes longer, but it still works quite well. At the end, it tallies up all the primes found, and tells you how many there are.
Fraser, 2007.

The following is a screenshot of the primefinder program.

Fraser, 2007.

Click here to see the source code for primefinder.

My final program is a much more visual program. Simply enter a number to test in the field, and then press "Test". The program will tell you whether or not the number is prime. Click here to download PrimeChecker1.0

Fraser, 2007.

History of Prime Numbers	Uses of Prime Numbers	Patterns in Prime Numbers	Types of Prime Numbers	Prime Number Programs I Wrote	Conclusion and Bibliography

Take Me Home!