Generate array of random different numbers

I want to create a program in C which creates N couples (x,y) of random numbers and respects following conditions :

• N is a random number between 5 and 13;


• all couples (xi, yi) are different;


• absolute difference between all x and y elements is at least 2.

I'm kind of breaking my head to solve this problem. I think that I should create three functions :

1. One function which will count the difference between the x or y element which is calculated and previous ones;


2. another function to check that all couples are different;


3. last function to compute the array.

For now I wrote these functions :

int different (int i, int N, int adress)
{
// write something to get the array back from the address of first element      
int count = 0;
for (int k=0; k<i; k++)
    {
        if (array[k][0]=array[i][0] && array[k][1]=array[i][1])
        count++;
    }
    return count;
}

/

int distance (int x, int i, int N, int adress)
{   
// write something to get the array back from the address of first element
    int count=0;
    for (int k = 0; k < i; ++k)
    {
        if (abs(array[i][x]-array[k][x]) < 2)
            count++;
    return count;
    }
}

/

type coordinates (void)
{
    N = rand()%8 + 5;
    int array[N][2];
    for (int i = 0; i < N; ++i)
    {
        do
        {
            int x = rand()%60 - 30;
            int y = rand()%60 - 30;
        } while (different(i, N, adress)>0 || distance(x, i, N, adress) || distance (y, i, N, adress));
        array[i][0] = x;
        array[i][1] = y;
    }
}

Actually I dont know how to give parameters from one function to another. I think I should use pointers but dont really know how.

If someone can help me, my brain would be happy. Because I try to change my point of view about this problem but there's always something wrong that i can solve.

Thank you in advance! :)