int[] arr = {4, 2, 34, 6, 70, 1, -4};

void setup() {
  selectionSort(arr);
  println(arr);
}
void selectionSort(int[] A) {
  int pos;

  for (int i=0; i<A.length; i++) {
    //find pos the position of the smallest element in A[i] ... A[N-1]
    pos = i;
    for (int j=i+1; j<A.length; j++) {
      if (A[j]<A[pos]) {
        pos=j;
      }
    }

    //swap the contents of A[i] and A[pos]
    int temp = A[i];
    A[i] = A[pos];
    A[pos] = temp;
  }
}//selectionSort();