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

- 141.1K All Categories
- 103.8K Programming Languages
- 6.5K Assembler Developer
- 1.9K Basic
- 40K C and C++
- 2.9K C#
- 7.9K Delphi and Kylix
- 4 Haskell
- 9.7K Java
- 4.1K Pascal
- 1.3K Perl
- 2K PHP
- 551 Python
- 37 Ruby
- 4.4K VB.NET
- 1.6K VBA
- 20.9K Visual Basic
- 2.6K Game programming
- 317 Console programming
- 93 DirectX Game dev
- 1 Minecraft
- 112 Newbie Game Programmers
- 2 Oculus Rift
- 9K Applications
- 1.8K Computer Graphics
- 745 Computer Hardware
- 3.5K Database & SQL
- 535 Electronics development
- 1.6K Matlab
- 628 Sound & Music
- 258 XML Development
- 3.3K Classifieds
- 199 Co-operative Projects
- 199 For sale
- 190 FreeLance Software City
- 1.9K Jobs Available
- 604 Jobs Wanted
- 211 Wanted
- 2.9K Microsoft .NET
- 1.8K ASP.NET
- 1.1K .NET General
- 3.4K Miscellaneous
- 7 Join the Team
- 356 Comments on this site
- 70 Computer Emulators
- 2.1K General programming
- 187 New programming languages
- 638 Off topic board
- 220 Mobile & Wireless
- 92 Android
- 126 Palm Pilot
- 340 Multimedia
- 156 Demo programming
- 184 MP3 programming
- Bash scripts
- 27 Cloud Computing
- 53 FreeBSD
- 1.7K LINUX programming
- 371 MS-DOS
- Shell scripting
- 321 Windows CE & Pocket PC
- 4.1K Windows programming
- 943 Software Development
- 417 Algorithms
- 68 Object Orientation
- 92 Project Management
- 95 Quality & Testing
- 270 Security
- 7.7K WEB-Development
- 1.8K Active Server Pages
- 62 AJAX
- 6 Bootstrap Themes
- 55 CGI Development
- 28 ColdFusion
- 224 Flash development
- 1.4K HTML & WEB-Design
- 1.4K Internet Development
- 2.2K JavaScript
- 37 JQuery
- 309 WEB Servers
- 155 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

© 1997-2017 Programmersheaven.com - All rights reserved.

## Comments

149:

:

: 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

7: : 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

:

67✭Read here prime numbers