More stuffs on Ruby

Variables and identifers normally start with an alphabetic letter or a special modifier.

• Local variables (&pseudo-variables such as self and nil) begin with a lowrcase letter.
• Global variables begin with dollar sign($)
• Instance variables with an object begin with an at sign(@)
• Class variables within a class begin with two at signs @@.
• Constant begin with capital letters.

For Example

1. local variables: alpha_ident,gama
2. pseudo-variables:self,nil
3. Constants:LENGTH,Length
4. Instance variables:@sum,@not_const
5. Class variable:@@my_var
6. Global variable:$beta,$pi

We will see some codes in ruby in the next post