Answer Posted / vadim

print tree by levels not recursive in C language


typedef struct treeNode{
int data;
struct treeNode* left;
struct treeNode* right;
} TreeNode;


typedef struct tree{
TreeNode* root;
} Tree;


typedef struct listNode{
TreeNode* dataPtr;
struct listNode* next;
struct listNode* prev;
} ListNode;

typedef struct list
{
ListNode* head;
ListNode* tail;
} List;



//main function : you still will need to write all the mini
functions that i have used here ...


void printByLevels(Tree tr)
{
TreeNode *curr;
List *lst;

lst=(List *)malloc(sizeof(List));
makeEmptyList(lst);
insertDataToStartDList(lst,tr.root);


while(isEmptyList(lst)!=TRUE)
{
curr=lst->tail->dataPtr;

if (curr->left!=NULL)
insertDataToStartDList(lst,curr->left);

if(curr->right!=NULL)
insertDataToStartDList(lst,curr->right);

printf("%d ",curr->data);
RemoveLastNodeInList(lst);

}//while

}

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