voidABC(BTNode*BT){ifBT{ABC(BT->left);ABC(BT->right);cout<data<
voidABC(BTNode*BT){ifBT{ABC(BT->left);ABC(BT->right);cout<data<
1
voidABC(BTNode*BT){ifBT{ABC(BT->left);ABC(BT->right);cout<data<