How to Declare Variables?
A typical variable declaration is of the form:
// Declaring a single variable type variable_name; // Declaring multiple variables: type variable1_name, variable2_name, variable3_name;
A variable name can consist of alphabets (both upper and lower case), numbers, and the underscore ‘_’ character. However, the name must not start with a number.
In the above diagram,
datatype: Type of data that can be stored in this variable.
variable_name: Name given to the variable.
value: It is the initial value stored in the variable.
Examples:
// Declaring float variable float simpleInterest; // Declaring integer variable int time, speed; // Declaring character variable char var;
We can also provide values while declaring the variables as given below:
int a=50,b=100; //declaring 2 variable of integer type float f=50.8; //declaring 1 variable of float type char c='Z'; //declaring 1 variable of char type
C++ Variables
Variables in C++ is a name given to a memory location. It is the basic unit of storage in a program.
- The value stored in a variable can be changed during program execution.
- A variable is only a name given to a memory location, all the operations done on the variable effects that memory location.
- In C++, all the variables must be declared before use.
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