It looks like you're new here. If you want to get involved, click one of these buttons!

- 141.3K All Categories
- 104.5K Programming Languages
- 6.4K Assembler Developer
- 1.9K Basic
- 39.8K C and C++
- 4.3K C#
- 7.9K Delphi and Kylix
- 4 Haskell
- 9.6K Java
- 4.1K Pascal
- 1.3K Perl
- 2K PHP
- 513 Python
- 48 Ruby
- 4.3K VB.NET
- 1.6K VBA
- 20.8K Visual Basic
- 2.6K Game programming
- 311 Console programming
- 89 DirectX Game dev
- 1 Minecraft
- 110 Newbie Game Programmers
- 2 Oculus Rift
- 8.9K Applications
- 1.8K Computer Graphics
- 729 Computer Hardware
- 3.4K Database & SQL
- 522 Electronics development
- 1.6K Matlab
- 628 Sound & Music
- 256 XML Development
- 3.3K Classifieds
- 195 Co-operative Projects
- 182 For sale
- 189 FreeLance Software City
- 1.9K Jobs Available
- 600 Jobs Wanted
- 201 Wanted
- 2.9K Microsoft .NET
- 1.7K ASP.NET
- 1.1K .NET General
- 3.2K Miscellaneous
- 3 Join the Team
- 0 User Profiles
- 349 Comments on this site
- 59 Computer Emulators
- 2K General programming
- 178 New programming languages
- 610 Off topic board
- 167 Mobile & Wireless
- 41 Android
- 124 Palm Pilot
- 335 Multimedia
- 151 Demo programming
- 184 MP3 programming
- 0 Bash scripts
- 19 Cloud Computing
- 53 FreeBSD
- 1.7K LINUX programming
- 367 MS-DOS
- 0 Shell scripting
- 320 Windows CE & Pocket PC
- 4.1K Windows programming
- 888 Software Development
- 405 Algorithms
- 68 Object Orientation
- 87 Project Management
- 90 Quality & Testing
- 237 Security
- 7.5K WEB-Development
- 1.8K Active Server Pages
- 61 AJAX
- 2 Bootstrap Themes
- 55 CGI Development
- 19 ColdFusion
- 222 Flash development
- 1.4K HTML & WEB-Design
- 1.4K Internet Development
- 2.2K JavaScript
- 34 JQuery
- 283 WEB Servers
- 149 WEB-Services / SOAP

I can do it all easily enough, except for finding prime numbers.. I suspect it's something to do with the modulas (remainder) operator but not real sure how to lay it out, any help is appreciated guys & gals. ^^

Terms of use / Privacy statement / Publisher: Lars Hagelin

Programmers Heaven articles / Programmers Heaven files / Programmers Heaven uploaded content / Programmers Heaven C Sharp ebook / Operated by CommunityHeaven LLC

© 1997-2015 Programmersheaven.com - All rights reserved.

## Comments

149Member:

:

: I can do it all easily enough, except for finding prime numbers.. I suspect it's something to do with the modulas (remainder) operator but not real sure how to lay it out, any help is appreciated guys & gals. ^^

:

Here's an easy (and fast) algorithm (pen and paper implementation;) for finding primes up to a certian number:

[code]

// I don't know if 1 is a prime number, so we'll skip it

write down the numbers from 2 to lets say 100.

put a circle around 2 and cross out all higher multiples of 2 (4, 6, 8 etc)

while there are numbers without a circle or a cross:

{

find the next noncrossed number and put a circle around it, and cross out all higher multiples of this number

}

all numbers with circles around them are prime

[/code]

good luck,

Pruyque

7Member: : Hey all, I'm on an assignment and a bit lost. I'm supposed to write a program that finds the average of all prime numbers between 1 and 100 and prints this average to screen:

: :

: :

: : I can do it all easily enough, except for finding prime numbers.. I suspect it's something to do with the modulas (remainder) operator but not real sure how to lay it out, any help is appreciated guys & gals. ^^

: :

:

: Here's an easy (and fast) algorithm (pen and paper implementation;) for finding primes up to a certian number:

:

: [code]

: // I don't know if 1 is a prime number, so we'll skip it

: write down the numbers from 2 to lets say 100.

: put a circle around 2 and cross out all higher multiples of 2 (4, 6, 8 etc)

: while there are numbers without a circle or a cross:

: {

: find the next noncrossed number and put a circle around it, and cross out all higher multiples of this number

: }

: all numbers with circles around them are prime

: [/code]

:

: good luck,

: Pruyque

:

67Member ✭Read here prime numbers