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Literary strings [Lua 5.1]

So I started learning Lua (5.1) and I saw this thing called literal strings. And I have no idea what they are doing. The manual states that \ a is a bell, but when I type

print('hello\athere')

The IDE prints out a weird square labeled "bel". So if someone can help me and explain each of them [Literary lines]. that would be really helpful.

ps i am using Sublime Text 3

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3 answers


Only ASCII between 0x20

and 0x7E

printable characters . How other characters, including '\a'

and '\b'

, are displayed is implementation dependent.



'\a'

, ASCII 7

for BEL

, is for warning use. On output, a '\a'

Typical terminal would give an audible or visible warning. Your IDE decided to show a different result than the warning. This is ok since it is up to implementation.

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Literal - is not more than the value in the code, for example 'some text'

.



'\a'

- is not nothing. A special "char" that is used for sound output (used by pc-speaker a few eons ago).

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These sequences are called "escape sequences" and are found in many different languages. They are used to encode non-printable characters such as newlines in letter strings (hardcoded).

Lua supports the following escape sequences:

  • \a

    : Bell
  • \b

    : Backspace
  • \f

    : shape channel
  • \n

    : Newline
  • \r

    : Carriage return
  • \t

    : tab
  • \v

    : vertical tab
  • \\

    : backslash
  • \"

    : Double quote
  • \'

    : single quote
  • \nnn

    : Octal value ( nnn

    - 3 octal digits)
  • \xNN

    : Hexadecimal value (Lua5.2 / LuaJIT, NN

    - two hexadecimal digits)
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