c - Printing left and right values of an avl tree -

i trying write piece of code displays integers being loaded binary tree. have written far:

node*t;     t = null;  for( j = 0; j < 33; j++) {     printf ("table %d \n", j+1);     printf ("linenum  left  data   right\n");     printf ("%5d %5d %5d %5d", t->num, t->left->data, t->data, t-> right -> data);           t = insert(j, a[j], t );   } 

the program still keeps crashing though. how can solve that? going wrong way?

edit: fixed problem pointed out in previous comments

printf ("%5d %5d %5d %5d", t->num, t->left->data, t->data, t-> left ->right); 

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do mean t->right->data?