It is similar to head node which gather, control data collected by other sensor node.

A Berkeley mote is a wireless sensor module manufactured by Berkeley. Typically a sensor node is composed of: sensing capabilities, communication radio, computation unit and a power source.

_node* search (_node* head, _key key) {

_node* node;

for (node=head; node != NULL;;) {

if (key == node->key) return node;

else if (key < node.>key) node = node->left;

else node = node->right;

}

return node;

}

for (node=head; node!=null; node=node->next) printnode(node);

Refer to http://cslibrary.stanford.edu/110/BinaryTrees.html

void mirror(struct node* node) {

if (node==NULL) {

return;

}

else {

struct node* temp; // do the subtrees

mirror(node->left);

mirror(node->right); // swap the pointers in this node

temp = node->left;

node->left = node->right;

node->right = temp;

}

}