String/Character Handling
All “str” functions require input strings be terminated with a null byte
Some of the most common ones:
strlen, strcpy, strcmp, strcat
strtok used for extracting "tokens" from strings
memcpy not just for strings!
strncmp allows limits to be placed on length of strings, other 'n' string functions
Some function for testing/converting single characters:
isalpha, isdigit, isspace
toupper, tolower
atoi, atol