Generate random numbers in C program

ssaslam · 02-21-2008, 05:05 PM

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;
}

chrism01 · 02-21-2008, 05:08 PM

Can you explain a bit more. That prog produces rand nums ok; what do you mean you want them in a 'sequence' ?

rg.viza · 02-21-2008, 05:14 PM

Quote:

Originally Posted by ssaslam

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

bigrigdriver · 02-21-2008, 05:19 PM

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

ssaslam · 02-21-2008, 09:51 PM

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

sry abt the mis...

It_Linux · 10-23-2008, 08:28 PM

Thasnks for your answers. GOD Bless you.