why cross out cout make result different?

[eric lin]

I have tried to copy QuickSort c++ programs:
-----------------------------------------------
#include <iostream>
using namespace std;

class Element
{
public: 
  int getKey() const { return key;};
  void setKey(int k) { key=k;};
private:
  int key;
  // other fields

};

#define InterChange(list, i, j)  t=list[j]; list[i]=list[j]; list[j]=t;
/*-------------------------------------------------------------------------------------*/


void QuickSort(Element list[], /* const */ int left, /*const */ int right)
// Sort records list[left], ..., list[right] into nondescreasing order on field 
key.
// Key pivot = list[left].key is arbitrarily chosen as the pivot key.  Pointer 
i and j
// are used to partition the sublist so that at any time list[m].key <= pivot, 
m < i;
// and list[m].key >= pivot, m>j.  It is assumed that list[left].key 
<=list[right+1].key.
{
Element t;

  if (left<right) {
     int i = left,
         j=right+1,
         pivot=list[left].getKey();
     do {
        do i++;  while(list[i].getKey() < pivot);
        do j--;  while(list[j].getKey() > pivot);
        if (i<j) InterChange(list, i, j);
      } while(i<j);
     InterChange(list, left, j);
 
     cout << "---show bankaccount1[0]= " << list[0].getKey() << " 
bankaccount1[1]= " << list[1].getKey() <<  " bankaccount1[7]= " << 
list[7].getKey() << " its left= " << left << endl;
     QuickSort(list, left, j-1);
     QuickSort(list, j+1, right);
  }
}

/*--------------------------------------------------------------------------------------------*/

int main() {
  Element bankaccount1[10];
  int l1, r1;

  bankaccount1[0].setKey(26);
  bankaccount1[1].setKey(5);
  bankaccount1[2].setKey(37);
  bankaccount1[3].setKey(1);
  bankaccount1[4].setKey(61);
  bankaccount1[5].setKey(11);
  bankaccount1[6].setKey(59);
  bankaccount1[7].setKey(15);
  bankaccount1[8].setKey(48);
  bankaccount1[9].setKey(19);
  l1=0;
  r1=9;

  for (int i=0; i<10; i++)
    cout << bankaccount1[i].getKey() << "  " ;
  cout << endl;

  QuickSort(bankaccount1, l1, r1);
  for (int i=0; i<10; i++)
    cout << bankaccount1[i].getKey() << "  " ;
  cout << endl;

return 0;
}
/*---------------------------------------------------------------------------------*/
if I (or you) commnet out cout show bankaccount1 that line, it will show 
different results
both result s are not what I expected(accroding to books)
I am in 4.6.1

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