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Node:<a name="Strings">Strings</a>,

Next:<a rel="next" accesskey="n" href="Chars.html#Chars">Chars</a>,

Up:<a rel="up" accesskey="u" href="Characters.html#Characters">Characters</a>

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<h5 class="subsubsection">Strings</h5>



   <p>A <dfn>string</dfn> is written between double-quotes.  It may contain

double-quotes or null characters.  The way to get special characters

into a string is to <dfn>escape</dfn> these characters: precede them with

a backslash <code>\</code> character.  For example <code>\\</code> represents

one backslash:  the first <code>\</code> is an escape which tells

<code>as</code> to interpret the second character literally as a backslash

(which prevents <code>as</code> from recognizing the second <code>\</code> as an

escape character).  The complete list of escapes follows.



     <dl>

<dt><kbd>\b</kbd>

     <dd>Mnemonic for backspace; for ASCII this is octal code 010.



     <br><dt><kbd>\f</kbd>

     <dd>Mnemonic for FormFeed; for ASCII this is octal code 014.



     <br><dt><kbd>\n</kbd>

     <dd>Mnemonic for newline; for ASCII this is octal code 012.



     <br><dt><kbd>\r</kbd>

     <dd>Mnemonic for carriage-Return; for ASCII this is octal code 015.



     <br><dt><kbd>\t</kbd>

     <dd>Mnemonic for horizontal Tab; for ASCII this is octal code 011.



     <br><dt><kbd>\ </kbd><var>digit</var><kbd> </kbd><var>digit</var><kbd> </kbd><var>digit</var><kbd></kbd>

     <dd>An octal character code.  The numeric code is 3 octal digits. 

For compatibility with other Unix systems, 8 and 9 are accepted as digits:

for example, <code>\008</code> has the value 010, and <code>\009</code> the value 011.



     <br><dt><kbd>\</kbd><code>x</code><kbd> </kbd><var>hex-digits...</var><kbd></kbd>

     <dd>A hex character code.  All trailing hex digits are combined.  Either upper or

lower case <code>x</code> works.



     <br><dt><kbd>\\</kbd>

     <dd>Represents one <code>\</code> character.



     <br><dt><kbd>\"</kbd>

     <dd>Represents one <code>"</code> character.  Needed in strings to represent

this character, because an unescaped <code>"</code> would end the string.



     <br><dt><kbd>\ </kbd><var>anything-else</var><kbd></kbd>

     <dd>Any other character when escaped by <kbd>\</kbd> gives a warning, but

assembles as if the <code>\</code> was not present.  The idea is that if

you used an escape sequence you clearly didn't want the literal

interpretation of the following character.  However <code>as</code> has no

other interpretation, so <code>as</code> knows it is giving you the wrong

code and warns you of the fact. 

</dl>



   <p>Which characters are escapable, and what those escapes represent,

varies widely among assemblers.  The current set is what we think

the BSD 4.2 assembler recognizes, and is a subset of what most C

compilers recognize.  If you are in doubt, do not use an escape

sequence.



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