Why not write the program in a way where you figure out dynamically when the program is run how much memory you need rather than hard coding in two with or within that constant.

为什么不写一个可以动态的方式写那个程序,程序可以动态分配内存,而不是用常量硬编码两个值。

哈佛公开课 - 计算机科学课程节选

Its name is malloc for memory allocation and what malloc does for us is we say, hmm, the user has typed in a three-letter word.

它为我们分配内存地址,它为用户输入的3个字母单词,分配地址。

哈佛公开课 - 计算机科学课程节选

It just needs to know how many bytes of memory do you want?

它需要知道你想分配多少字节的内存？

哈佛公开课 - 计算机科学课程节选

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。

哈佛公开课 - 计算机科学课程节选

All I did was ask for memory.

我所做的是请求分配内存。

哈佛公开课 - 计算机科学课程节选

So, certainly the CS50 Library designed to be dynamic and, in fact, any time you call get string, we are, in fact, ; allocating a chunk of RAM but it's not coming from the stack; it's actually coming from this portion of memory called the heap.

所以，Cs50库是动态设计的，实际上，每次你调用GetSting时，我们分配一块内存，但它不是来自栈;,而是来自于叫做堆的,内存的一部分。

哈佛公开课 - 计算机科学课程节选