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Old 02-21-2008, 05:05 PM   #1
ssaslam
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Registered: Feb 2008
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Generate random numbers in C program


Hi, im a newbie here...
Can any one show me a sample program for generating random number like 1,4,7,10,13,16,19........
i need it in c program i'm trying this but it just produces a random number... i need it in a sequence... so please help!!!!!!!
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int
main (int argc, char *argv[])
{
/* Simple "srand()" seed: just use "time()" */
unsigned int iseed = (unsigned int)time(NULL);
srand (iseed);

/* Now generate 5 pseudo-random numbers */
int i;
for (i=0; i<5; i++)
{
printf ("rand[%d]= %u\n",
i, rand ());
system ("PAUSE");
}
return 0;
}
 
Old 02-21-2008, 05:08 PM   #2
chrism01
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Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.5, Centos 5.10
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Can you explain a bit more. That prog produces rand nums ok; what do you mean you want them in a 'sequence' ?
 
Old 02-21-2008, 05:14 PM   #3
rg.viza
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Registered: Aug 2006
Posts: 73

Rep: Reputation: 15
Quote:
Originally Posted by ssaslam View Post
Hi, im a newbie here...
Can any one show me a sample program for generating random number like 1,4,7,10,13,16,19........
i need it in c program i'm trying this but it just produces a random number... i need it in a sequence... so please help!!!!!!!
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int
main (int argc, char *argv[])
{
/* Simple "srand()" seed: just use "time()" */
unsigned int iseed = (unsigned int)time(NULL);
srand (iseed);

/* Now generate 5 pseudo-random numbers */
int i;
for (i=0; i<5; i++)
{
printf ("rand[%d]= %u\n",
i, rand ());
system ("PAUSE");
}
return 0;
}
use the numbers to populate an array, then sort the array. Figure out how to code this and you've learned something.

Edit: this is really a question about programming in C.
-Viz

Last edited by rg.viza; 02-21-2008 at 05:16 PM.
 
Old 02-21-2008, 05:19 PM   #4
bigrigdriver
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Registered: Jul 2002
Location: East Centra Illinois, USA
Distribution: Debian Squeeze
Posts: 5,772

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Quote:
Can any one show me a sample program for generating random number like 1,4,7,10,13,16,19.....
This is not a set of random numbers; this is a sequence of numbers which begins with the number 1, adds 3 to the first number, adds 3 to the to the second sum, etc. What's so difficult about that?

I mean, really, it isn't even as difficult at a Fibonacci series, which isn't all that difficult. But it is a bit more difficult than a simple series incremented by three at each increase.

number=1 to start the series

followed by

number+=3 to continue the series

Last edited by bigrigdriver; 02-21-2008 at 05:22 PM.
 
Old 02-21-2008, 09:51 PM   #5
ssaslam
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Registered: Feb 2008
Posts: 3

Original Poster
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wut was i thinking...

i meant real numbers....
like 6 places
all i want it to show is 1,4,7,10,and 13

sry abt the mis...
 
Old 10-23-2008, 08:28 PM   #6
It_Linux
LQ Newbie
 
Registered: Oct 2008
Posts: 1

Rep: Reputation: 0
Thanks a lot

Thasnks for your answers. GOD Bless you.
 
  


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