In previous chapters, you learned how to store integer and floating-point numbers in a variable. However, one of the more common types of data to store is text, otherwise known as a string.
There are two parts to a string in Objective-C. First, you must identify a string by using the
@ symbol, which identifies the string as a special Objective-C string. Second, you must enclose the string inside double quotation marks, such as
@"This is a string" or
@"555-1212 is also a string." Strings can contain any characters, including numbers, symbols, and letters.
To store and manipulate strings when creating Mac programs, you use a string class called
NSString. One advantage of creating an object from an
NSString class is ...