In this C++ tutorial, you will learn about variables, how to declare variables, initialize variables, and how to use variables in programs, with examples.
C++ Variables
In C++, Variables are used to store the values. In reality, variable is a location in memory which can be accessed using a symbolic name given to the variable.
In C++, a variable is declared with a datatype and a name. The datatype determines the type of data that can be stored in that variable.
Declare Variable(s)
The syntax to declare a variable is
datatype name;
where
datatype is the type of data that is allowed to store in this variable, and name is the name of the variable through which we can access the value stored in variable.
In the following, we declared a variable with name x, and type int.
int x;
We can define more than one variable in a single statement using the following syntax.
datatype v1, v2, v3;
where v1, v2 and v3 are variables.
In the following, we declared three variables: x, y and z of type int in a single statement.
int x, y, z;
Initialise Variable(s)
The syntax to initialise a variable using assignment operator is
datatype name = value;
where
value is the initial value assigned to the variable.
In the following, we initialised variable x with value 25.
int x = 25;
We can initialise more than one variable in a single statement using the following syntax.
datatype v1 = value, v2 = value, v3 = value;
where v1, v2 and v3 are variables.
In the following, we initialise three variables: x, y and z of type int with different values in a single statement.
int x = 0, y = 5, z = 9;
Conclusion
In this C++ Tutorial, we learned what variables are in C++, and how to use declare and initialise variables, with the help of examples.