Re: Generating random numbers
Re: Generating random numbers
- Subject: Re: Generating random numbers
- From: Mahaboob <email@hidden>
- Date: Thu, 06 Aug 2009 10:29:26 +0530
- Thread-topic: Generating random numbers
Thanks.
It is working well.
On 8/5/09 10:24 PM, "Agha Khan" <email@hidden> wrote:
> Dear Mahaboob:
> Many people have answered this question but I will take this route.
>
> First of all you only have call srandom once in you program. Best place is
> when you are going to load the object.
>
> I defined 2 macros
>
> #define RANDOM_SEED() srandom(time(NULL))
> #define RANDOM_INT(__MIN__, __MAX__) ((__MIN__) + random() % ((__MAX__+1) -
> (__MIN__)))
>
> #define ARRAYSIZE 15
>
> Now I assume that you already called RANDOM_SEDD previously.
> Now create an array with your range of your numbers. In your case 1 to 16.
>
> int RandArray[ARRAYSIZE];
>
> for (int i = 0; i < ARRAYSIZE; i++)
> {
> RandArray[i] = i + 1; // choose your own range
> }
>
> Now shuffle them
>
> for (int i = 0; i < ARRAYSIZE; i++)
> {
> int RandomNumber = RANDOM_INT(0, ARRAYSIZE);
> int temp = RandArray[RandomNumber];
> RandArray[RandomNumber] = RandArray[i];
> RandArray[i] = temp
> }
>
> :-)
> Agha
>
> On Aug 5, 2009, at 3:44 AM, Mahaboob wrote:
>
>> I need to produce 15 random numbers between 1 to 16 without repeating any
>> number. I used the code like
>>
>> int i,j;
>> for(i=0;i<15;i++){
>> j =random() % 15 +1;
>> NSLog(@"No: %d => %d \n",i,j);
>> srandom(time(NULL)+i);
>> }
>> But some numbers are repeating.
>> How can I do it without repeating the numbers?
>>
>> Thanks in advance
>> Mahaboob
>>
>>
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