You actually need to kind of do this and then you can swap these two numbers but it requires 50 percent more memory.

你实际上需要这样做,然后才能交换两个数字,但是它需要多50%的内存。

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So when I said earlier that as soon as swap returns, all of the memory allocated for swap is now useless.

我前面指明的，一旦swap返回，所有为swap分配的内存都是无用的了。

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But the moment swap returns, the moment we hit this bottom most curly brace, what conceptually happens in memory?

但是swap返回时，当我们抵达花括号底端是，在内存中发生了什么？

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Now finally swap has the ability, the power, to modify memory that isn't his own, that's not in his own scope because we've passed it in by address.

最终swap有能力，来修改不属于它的内存，不在它的作用域中,因为我们是通过地址传递的。

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So A gets 1, B gets 2, now the swap function itself starts executing line by line; so I declare a chunk of memory called temp.

所以A等于1，B等于2，现在swap函数自己开始,一行一行地执行，所以我声明了,叫做temp的一块内存。

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So swap has three chunks of memory.

所以swap占有三块内存。

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X That's just the special symbol in C that says don't pass X, that is don't pass a copy of X. Rather figure out where x is in memory, where he is in that frame and provide swap the numeric address in RAM of that value so that swap can go do anything it wants at that address.

这在C中是一个特殊的符号，指明不传送，也不是传递X的拷贝，而是指出x在内存中哪个地方,它在那个框架中的哪个地方,提供给swap它的地址值,这样swap就可以使用那个地址中的数据。

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