Variable Declaration Rule in C++

To Declare any variable in C++ you need to follow rules and regulation of C++ Language, which is given below;
  • Every variable name should start with alphabets or underscore (_).
  • No spaces are allowed in variable declaration.
  • Except underscore (_) no special symbol are allowed in the middle of the variable declaration.
  • Maximum length of variable is 8 characters depend on compiler and operation system.
  • Every variable name always should exist in the left hand side of assignment operator.
  • No keyword should access variable name.
Note: In a c program variable name always can be used to identify the input or output data.

Variable declarations

This is the process of allocating sufficient memory space for the data in term of variable.


Datatype  variable_name;
int  a;

If no input values are assigned by the user than system will gives a default value called garbage value.