14. String Manipulation


As has been mentioned earlier in the guide, a string in C is a sequence of bytes in memory, terminated by a NUL character ('\0'). The NUL at the end is important, since it lets all these string functions (and printf() and puts() and everything else that deals with a string) know where the end of the string actually is.

Fortunately, when you operate on a string using one of these many functions available to you, they add the NUL terminator on for you, so you actually rarely have to keep track of it yourself. (Sometimes you do, especially if you're building a string from scratch a character at a time or something.)

In this section you'll find functions for pulling substrings out of strings, concatenating strings together, getting the length of a string, and so forth and so on.