Variables in C++
A 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.
Variable can also be thought as a container,which is storing some values
Let’s see the syntax to declare a variable:
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 variables
- A 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;