Can you tell me the all rules to declare the variable name

[garggaurav628 (Gaurav Garg)]

can you tell me the all rules to declare the variable name

[S18ML0016 (Virender Singh)]

Following are the naming rules for variables:

1. Variable names can be of 1 to 255 characters long.
2. All variable names must begin with an alphabet or an underscore(_).
3. After the first initial letter, variable names can also contain letters and numbers.
4. Variable names are case sensitive.
5. No spaces or special characters are allowed except underscore(_).

Hope, this would help.