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How we can find the prime number

 
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mauvis

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Joined: 27 Jul 2007
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Location: india

PostPosted: Wed Aug 29, 2007 12:34 am    Post subject: How we can find the prime number
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Can anyone tell me how we can find the prime number?

i need a simple logic...i need to accept a number through the JCL and have to check through cobol for prime no...

Mauvis
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superk

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Joined: 26 Apr 2004
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Location: Raleigh, NC, USA

PostPosted: Wed Aug 29, 2007 12:40 am    Post subject: Reply to: prime number
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A Google search led to this website which has an example program.
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Balraj

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PostPosted: Wed Aug 29, 2007 10:29 am    Post subject:
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Logic

Accept A

Perform varying i from 2 by 1 untill i > A

Divide A by i giving c remainder D
if D = 0
Not a prime
stop run
End-if
end-perform
A is a prime no.
stop run.
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himanshupant

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Joined: 21 Mar 2007
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PostPosted: Tue Sep 25, 2007 1:20 pm    Post subject: after thought
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Just an afterthought , most of the times mainframe question / queries have some underlying Business requirement which needs to be satisfied , what was the business requirement behind this...


As for prime number bit , we can repeatedly divide the number ( Say x ) from 2 till x/2 and if in any of the case it divides exactly then its not a prime. We need not divide it till the number x.. This will reduce the number of iterations through loop

Correct me if I am wrong
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guptae

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PostPosted: Tue Sep 25, 2007 1:27 pm    Post subject:
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Hi himanshupant,

Code:
As for prime number bit , we can repeatedly divide the number ( Say x ) from 2 till x/2 and if in any of the case it divides exactly then its not a prime. We need not divide it till the number x.. This will reduce the number of iterations through loop



For prime number there is no need to divide till the number x/2 we can repeatedly divide the number til √x
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guptae

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PostPosted: Tue Sep 25, 2007 1:28 pm    Post subject:
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Hi All,

In my prev post i mean till square root of X
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