Shuffling an array

[Lang]

I have created a function that is supposed to shuffle the values in an array, I am having issues though - it doesn't seem to shuffle very well and I'm looking for some insight about how to go about it better.

void shuffle(int* a, int size){
	srand((unsigned)time(0)); 

	for (int i = 0; i < (size-1); ++i) {
        int r = i + (rand() &#37; (size-i)); // Random remaining position.
        int temp = a[i]; a[i] = a[r]; a[r] = temp;
    }
}

By not shuffling very well, I mean that I will frequently get the same result twice in a row.

EDIT

I also came up with this:

void shuffle(int* a, int size){
	srand((unsigned)time(0)); 

	for (int i = 0; i < (size-1); ++i) {
        double x=rand()/(RAND_MAX+1.0);
		int r = (int)(x * (size - 1));
		int temp = a[i]; a[i] = a[r]; a[r] = temp;
    }
}

it works well. Still, I'd like to see suggestions if anyone has any.

Thanks!