Programming in Objective-C, Fourth Edition

4. Data Types and Expressions

In this chapter, we take a look at the basic data types and describe some fundamental rules for forming arithmetic expressions in Objective-C.

Data Types and Constants

You have already encountered the Objective-C basic data type int. As you will recall, a variable declared to be of type int can be used to contain integral values only—that is, values that do not contain decimal digits.

The Objective-C programming language provides three other basic data types: float, double, and char. A variable declared to be of type float can be used for storing floating-point numbers (values containing decimal digits). The double type is the same as type float, typically with roughly twice the range. Finally, the char data type ...