[COLOR="Green"]'1. ascii code[/COLOR]
str = chr(34) & "apple" & chr(34)
[COLOR="Green"]'2. enclosed in single-quotes[/COLOR]
str = '"apple"'
[COLOR="Green"]'3. double double-quotes
' when enclosed in double-quotes, a pair of double-quotes will yield
' a single double-quote character[/COLOR]
str = """apple"""