Re: Generating random numbers
Re: Generating random numbers
- Subject: Re: Generating random numbers
- From: Agha Khan <email@hidden>
- Date: Wed, 05 Aug 2009 09:54:42 -0700
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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