C++ Variables

In C++ Programming language variable is used to store data in memory location.

Rules of Declaring variables in C++

• Variable name can consist of Capital letters A-Z, lowercase letters a-z, digits 0-9, and the underscore character.
• The first character must be a letter or underscore.
• Blank spaces cannot be used in variable names.
• Special characters like #, $ are not allowed.
• C++ keywords can not be used as variable names.
• Variable names are case sensitive.
• A variable name can be consist of 31 characters only if we declare a variable more than 1 characters compiler will ignore after 31 characters.

Variable Definition in C++

Syntax:

type variable_name;

type variable_name, variable_name, variable_name;

Example:

/* variable definition and initialization */
int    width, height=5;
char   letter='A';
float  age, area;
double d;

/* actual initialization */
width = 10;
age = 26.5;