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Variables

Variables:
          A quantity whose value may change during execution of the program is called variable.It is represented by a symbol or a name

Rules for writing variable names:
The following are the rules for writing a variable name in a program in c++:
  • The first character of variable name must be an alphabetic character.
  •  Underscore can be used as first character of variable name.
  • Blank spaces are not allowed in a variable name.
  • Special character, such as arithmetic operators,#,^,cannot be used in a variable name.
  • Reserved words cannot be used as variable names.
  • The maximum length of a variable name depends upon the compiler of c++.
  • A Variable name declared for one data-type cannot be used to declare another data-type.
Example:
 variables 'Pay' and 'pay' are two different variables.

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