Problem with random number generation

HAssan · 03-27-2007, 05:22 PM

Hello

I wrote this program to generate 256 random numbers. The numbers change each time the code is excuted. But I can't seem to limit the numbers from 1 to -1. Antother thing I can't seem to do is that I want the numbers to go up to 2 decimal placec. i.e. 1.11. I will be highly obliged if someone can point me inthe right direction.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main()
{

    float i,a;

    /* Set evil seed (initial seed) */
    srand( (unsigned)time( NULL ) );

    for (i = 0; i < 256; i++) 
    {
        a=rand()/10000;	
        printf("%f\n",a);
    }
   
    return 0;
}

**Dave_Sinkula** · 03-27-2007, 05:49 PM

Code:

a = rand() / (RAND_MAX / 2.0F) - 1;

03-27-2007, 05:22 PM	#1
HAssan Registered User Join Date: Sep 2005 Posts: 92	Problem with random number generation Hello I wrote this program to generate 256 random numbers. The numbers change each time the code is excuted. But I can't seem to limit the numbers from 1 to -1. Antother thing I can't seem to do is that I want the numbers to go up to 2 decimal placec. i.e. 1.11. I will be highly obliged if someone can point me inthe right direction. Code: #include <stdio.h> #include <stdlib.h> #include <time.h> int main() { float i,a; /* Set evil seed (initial seed) */ srand( (unsigned)time( NULL ) ); for (i = 0; i < 256; i++) { a=rand()/10000; printf("%f\n",a); } return 0; }
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03-27-2007, 05:49 PM	#2
Dave_Sinkula Just Lurking Join Date: Oct 2002 Posts: 5,006	Code: a = rand() / (RAND_MAX / 2.0F) - 1; __________________ 7. It is easier to write an incorrect program than understand a correct one. 40. There are two ways to write error-free programs; only the third one works.*
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