差不多，但不太完全.

C ++中的 if 语句未使用大写字母，因此您必须添加方括号，如下所示:

The if statement in C++ is not capitalized, and you must add brackets as follows:

void MyTree::Traverse(TreeNode *rt)
{
    if(rt != NULL)
    {
        Traverse(rt -> left);
        doSomething (rt);
        Traverse(rt -> right);
    }
}

如果不添加方括号，则无论节点是否有效，都将调用 doSomething(rt)和 Traverse(rt-> right)语句.不是！

If you do not add brackets, the statements doSomething(rt) and Traverse(rt->right) will be called no matter if the node is valid or not!