二叉树镜像

void TreeMirror(BinaryTreeNode *pNode) {if(pNode == NULL)   return;if(pNode->lChild == NULL && pNode->rChild == NULL)     return;BinaryTreeNode *temp = pNode->lChild;      pNode->lChild = pNode->rChild;  pNode->rChild = temp;if(pNode->lChild != NULL)   TreeMirror(pNode->lChild);if(pNode->rChild != NULL)   TreeMirror(pNode->rChild);}