Variables
Data
values in a program are usually stored in variables. In C++, if you want to use
avariable to hold some information, you must declare that variable before you use it.
Declaring
a variable establishes the following properties:
1 • Name. Every variable has a name, which‖ is formed according to the rules described in the section entitled ―Naming conventions later in this chapter. You use the name in the program to refer to the variable and the value it contains.
Type.Each variable in a C++ program is constrained to hold values of a particular data type. C++ includes several predefined types and also allows you to define new types of your own.
2• Lifetime. Depending on how they are
declared, some variables persist throughout the entire program, while others
are created and destroyed dynamically as the program moves through various
levels of function call.
3• Scope. The declaration of a variable
also controls what parts of the program have access to the variable, which is
called its scope.
The
standard syntax for declaring a variable is typenamelist;
int result; int result; result =
0;
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