Character

Only when English lowercase letter of charater constant and character variable is enclosed by two quotation marks,it can differentiate block letter and lowcase character.
We also can use following special notation.

Colon(:)	Separate more than two sentences in a line.
Comma(,)	Separate parameter.
Semicolon(;)	Separate output parameter
Prime Mark(')	Same as Rem,it is used to annotate sentence.
Asterisk(*)	Prefix of label name.
Empty Square( )	It must be seperated by empty square between command parameter and succeed parameter.
Two Quotation Marks(")	Substitute string variable with string.
And Symbol(&)	Use it in integer variable or array.
Orderly Mark(#)	Use it in double variable or array.
Dollar Mark($)	Use it in string variable or array.