1. Variable is an entity that change during program execution. Example when we write r = 45 i.e. x can hold different value at different times so r is a variable.
  2. A variable may be integer,character,float,double etc..
 Rules for constructing Variable Names : 
  • A variable name must be start with alphabet or underscore.
  • A variable name is any combination of 1 to 31 alphabets,digits or underscores.
  • No commas,special symbol(rather than underscore [ _ ] ) or blanks are allowed within a variable name
  • Example of valid variable names : ram, _ram, d_x, _voids, echo_,  

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