Question

How can we check if the number generated through
I am trying to generate a unique number in between 0 to 10.

randomNumber = arc4random() % 10;

is unique or not??

i am able to generate a random number, but not able to check,whether its unique or not?

Thanks

Answer 1

To avoid duplication, refer a following random number generation code. When you run the following code also does not overlap any number. If you mean you want it unique.

#define COUNT 1000
#define RANGE 1000
int num[COUNT];

bool isNew(int idx, int val)
{
    for (int i=0; i<idx; i++) 
    {
        if (num[i] == val) return false;
    }
    return true;
}

---

for (int i=0; i<COUNT; i++)
{
    do
    {
        num[i]=arc4random()%RANGE;        
    }
    while (!isNew(i, num[i]));
    NSLog(@"%d ", num[i]);
}