- Variable is a container where we will store out data .
- Variable is a memory location inside RAM .
Rules for define a variable name :
1 . Allowed Character
- All alphabets are allowed (A-Z and a-z)
- Numbers are allowed(0-9)
- Only one special symbol is allowed (_)
- Except (_) others are not allowed
Example:-
- abc=90 – – > valid
- abc@20=90 – – > invalid
2 . Variable name should be started with alphabet ,if we started with digit then compiler will gives us error .
Example:-
- abc=90 – – > valid
- 9abc=90 – – > invalid
3 . Space is not allowed in variable name
4 . Keyword name we can not use as our variable name .
Example:-
- if=90 – – > invalid
- while=90 – – > invalid
- else=90 – – > invalid