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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. ^^

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## 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