像 strcpy 是 string copy 来的
   strcat 是 string contact
   gets   是 get string
之类的。

那么问题来了：
calloc() malloc() 是怎么来了。我知道alloc是allocate.
顺带问一下 printf,scanf 的f是什么 ，function?

这有意义吗   即便我取名为add 我可以用来实现减法或者查询啥的

名称的定义我觉得就是要 见名知义 。
我觉得能知道组成函数名的词根能更好的让我这个小菜鸟记忆和运用 。

malloc --- allocate memory
printf --- format print

calloc() 呢？

这是一个迷，永远没答案，不过Brian Kernighan曾猜测可能是clear。

你在网上搜索一下，比如
http://cn.
能看到各种说法，随便贴一个你瞧瞧
The meaning of the c in calloc was vividly discussed in comp.lang.c in October 2000 (see here), with both clear (because, unlike malloc, calloc clears the memory it returns) and count (because, unlike malloc, calloc is passed a count of elements to allocate) suggested as possible explanations, however without real evidence for either. Other suggestions were (along with several less serious ones) contiguous, core, commit, chunk, and character, the latter because in early versions of K&R C, calloc was the only allocation function in the library (and had an accompanying cfree). For the same reason, it was even suggested that the c simply stand for the C programming language. So, the etymology of calloc still isn't proven, and if anybody has any definite evidence as to its meaning, I'd highly appreciate learning about it.

函数名称经过编译器编译后，其实就是程序在内存中代码段的一个地址，名称怎么编写都是这样的。不过名称的编写符合一定的命名规则有助于提高代码的可读性，方便交流。

感谢版主，说的太好了！
我也搜了一些，满足了我的好奇心和求知欲。