![]() To initialize a variable means to assign it a starting, or Second, a variable can pick up a value from a functionfrom scanf(), for example. How do variables get values? You've seen two ways that they can pick up values in the program. These declarations create variables but don't supply values for them. ![]() The effect is the same: Associate names and arrange storage space for four int-sized variables. You could have used a separate declaration for each variable, or you could have declared all four variables in the same statement. ![]() The following are valid declarations: int erns To declare more than one variable, you can declare each variable separately, or you can follow the int with a list of names in which each name is separated from the next by a comma. First comes int, and then the chosen name of the variable, and then a semicolon. Declaring an int VariableĪs you saw in Chapter 2, "Introducing C," the keyword int is used to declare the basic integer variable. ![]() Integers by using the value of a particular bit to indicate the sign. ISO/ANSI C specifies that the minimum range for type int should be from Moving toward 64-bit processors that naturally will use even larger integers. Have 32-bit integers and fit an int to that size. Therefore, older IBM PC compatibles, which have a 16-bit word, use 16īits to store an int. Typically, an int uses one machine word for That means it must be an integerĪnd it can be positive, negative, or zero. Requirements of a particular task or machine, they are available. Type is the basic choice, but should you need other choices to meet the Values offered and in whether negative numbers can be used. In particular, the C integer types vary in the range of The answer is that C gives the programmer the option of matching a type The int TypeĬ offers many integer types, and you might wonder why one type isn'tĮnough. ![]() Types, so check your documentation to see which ones you have available. Some older C compilers do not support all these ForĮach type, we describe how to declare a variable, how to represent a constant,Īnd what a typical use would be. Now let's look at the specifics of the basic data types used by C. ![]()
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