As well as doing calculations on numbers, you'll want your program to be able to handle strings of text - things like names and addresses and product codes ... and HTML tags and SQL queries too, perhaps. C defines strings as char[] types, and there's a whole raft of standard functions that are available to work on strings.

This topic is presented on public courses Programming in C, C and C++ Programming

cli.c	Command Line Handling
csame.c	Comparisons of strings in C
cstr.c	String manipulation in C
dynamic.c	memort allocation and release with calloc and free
dynbad.c	How NOT to do it - overrunning an array
fff	Some sample data
makefile	makefile for module C206
pothat.c	Strings via pointers and arrays of chars
rabbit.c	Structures and file i/o - C
readwrite.c	File handling basics in C
sti1.c	Characters and strings in C

Sprintf memory leak
C string funtion