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Is is possible to convert the following code without using recursive way??

Posted on 2006-06-10
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Last Modified: 2012-05-05
void level_order_aux ( node *tree, int level )
{
  if ( tree == 0 )
    return;

  if ( level == 0 )
    printf ( "%d ", tree->data );
  else if ( level > 0 ) {
    puts ( "Recurse left" );
    level_order_aux ( tree->left, level - 1 );
    puts ( "Recurse right" );
    level_order_aux ( tree->right, level - 1 );
  }
}

void level_order ( node *tree )
{
  for ( int d = 0; d <= height ( tree ); d++ )
    level_order_aux ( tree, d );
}
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Question by:shingo43
1 Comment
 
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by:
grg99 earned 375 total points
ID: 16879298
Sure, but you'd need an auxiliary array to remember where you've been, so you can back up.  SOmething very rougly like:

node * save [ MaxLevels ];

p = 0;

Save[ p ] = tree;  // save our place
while( tree->left != NULL ) {
  Save[ p++ ] = tree;  // save our place
  printf( "%d",  tree->data );
  tree = tree->left;
}

for( --p; p >= 0; p--) {  // now backtrack
tree = Save[ -- p ];  
while( tree->right != NULL ) {
  printf( "%d",  tree->data );
  tree = tree->right;
}
}
--- make that VERY roughly!

The basic idea is to instead of recursing, make an entry in the save array.  Then backup thru the info.


 

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