Arrange 0's & 1's in a array

Question

This is one of an interview question which I had recently. I would like to know others perception of approach for this problem.

Question:

Yo

Answer 1

Here is solution that works for an array of int. You can modify it.

sort (int [] a) {
   int pos = 0;
   for (int i = 1; i < a.length; i++) {
       if (a[i] == 0 && a[pos] == 1) {
           swap(a, pos, i);   // this makes all 0's go to the left.
           pos++;
       }
   } 
}