下面的查询在该行中应用了xmlrow和xmlgroup函数。

The following query applies the xmlrow and xmlgroup function to this row.

youdao

下面是使用这个函数的 C 代码（请将下面的代码输入到 my_square_tester.c 文件中）

Here is the C code for using the function (enter as my_square_tester.c)

youdao

在下面的例子中，函数返回某个字符串的连续小写字母。

In the following example, a function returns the successive lowercase characters of a string.

youdao

So, conceptually if you've ever wondered why you get access in all of your functions to global variables that's because they're not down here, they're at the very top of RAM and any function can access that RAM way up there, but for now the interesting player in the story is this thing called the heap.

所以，如果你想知道为什么全局变量能在,所有的函数中使用,那是因为它们不在这下面，而是在内存的顶端,那样任意函数都可以在内存中使用它们，现在，这里面一个有用的角色是,叫做堆的东西。

哈佛公开课 - 计算机科学课程节选