Thread: pointer of pointer of a structure data type unexpected variation

Code:

 Here is my problem: In the following code pcodewords  is pointer of pointers of structure type. NodeConstruct, GetCodeWord and nextcw  are functions with their own proper implementation. I am confused that eventhough the pointer pcodewords[0] is not affected by the do while loop, the printing results for its corrosponding structure variable before and after the do while loop are not the same. 

 I am really stacked because of this . I really need your help guys and it is urgent! 10q anyway!

  pcodewords[0]=NodeConstruct(cw,n);
  //printing values for checking
  int *p=GetCodeWord(pcodewords[0]);

    for(int j=0;j<n;j++)

      printf("%d", *(p+j));

    printf("\n");

  int *cexist,i=1;

  do

  {

    cexist=nextcw(cw,n);

    if(cexist)

      pcodewords[i]=NodeConstruct(cexist,n);
    ++i;
  }while(cexist);

  pcodewords[0]=NodeConstruct(cw0,n);

  //printing the values for checking
 
    int *p=GetCodeWord(pcodewords[0]);

    for(int j=0;j<n;j++)

      printf("%d", *(p+j));

    printf("\n");

  }