typedefintElemType; typedefstructbn{ ElemTypeitem; structbn*left,*right; }BTreeNode; boolFind(BTreeNode*BST,ElemType&item) { BTreeNode*now=BST; while(now) { if(item>now->item)now=now->right; elseif(itemitem)now=now->left; elsereturntrue; } returnfalse; }