If you know you're not gonna output a full string %C but a single character, percent C will get that job done.

如果你不想输出一个完整的字符串,而是输出一个字母，就要用到。

哈佛公开课 - 计算机科学课程节选

And what's in this output are all the C files that we happened to have printouts of for this particular week.

全部都是一些为这周准备的打印资料,都是一些C文件。

哈佛公开课 - 计算机科学课程节选

So you have to somehow convert the source code, the C code into 0s and 1s and for that process there exist this tool called a compiler that someone else wrote that takes this stuff as input and produces this stuff as output.

所以你必须把源代码，即C语言代码转换成二进制文件,这个过程就需要我们提到的编译器了,它是由别人编写的一个软件，以这些代码作为输入,将会产生的输出。

哈佛公开课 - 计算机科学课程节选