One of the main reasons people exercise is to control or reduce their weight.

VOA: special.2010.06.08

It turns out that in a lot of languages, C included, you the programmer knowing a bit about how the computer works and the language works, can exercise more fine-grained control.

结果在包括C语言的很多语言当中，你作为一个程序员懂得了一些计算机的工作方式,和语言的处理方式，可以更精确地控制运用它。

哈佛公开课 - 计算机科学课程节选