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C++ VariableA variable is a name of memory location. It is used to store data. Its value can be changed and it can be reused many times. It is a way to represent memory location through symbol so that it can be easily identified. Let's see the syntax to declare a variable: type variable_list; The example of declaring variable is given below: int x; float y; char z; Here, x, y, z are variables and int, float, char are data types. We can also provide values while declaring the variables as given below: int x=5,b=10; //declaring 2 variable of integer type float f=30.8; char c='A'; Rules for defining variablesA variable can have alphabets, digits and underscore. A variable name can start with alphabet and underscore only. It can't start with digit. No white space is allowed within variable name. A variable name must not be any reserved word or keyword e.g. char, float etc. Valid variable names: int a; int _ab; int a30; Invalid variable names: int 4; int x y; int double;
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