Variable
- 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.
- 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_,
