28 Chapter 4. Syntax\rMnemonic for carriage-Return; for ASCII this is octal code 015.\tMnemonic for horizontal Tab; for ASCII this is octal code 011.\ digit digit digitAn octal character code. The numeric code is 3 octal digits. For compatibility with other Unixsystems, 8 and 9 are accepted as digits: for example, \008 has the value 010, and \009 the value011.\x hex-digits...A hex character code. All trailing hex digits are combined. Either upper or lower case x works.\\Represents one \ character.\"Represents one " character. Needed in strings to represent this character, because an unescaped" would end the string.\ anything-elseAny other character when escaped by \ gives a warning, but assembles as if the \ was not present.The idea is that if you used an escape sequence you clearly didn’t want the literal interpretationof the following character. However as has no other interpretation, so as knows it is giving youthe wrong code and warns you of the fact.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 Ccompilers recognize. If you are in doubt, do not use an escape sequence.4.6.1.2. CharactersA single character may be written as a single quote immediately followed by that character. The sameescapes apply to characters as to strings. So if you want to write the character backslash, you mustwrite ’\\ where the first \ escapes the second \. As you can see, the quote is an acute accent, not agrave accent. A newline immediately following an acute accent is taken as a literal character and doesnot count as the end of a statement. The value of a character constant in a numeric expression is themachine’s byte-wide code for that character. as assumes your character code is ASCII: ’A means 65,’B means 66, and so on.4.6.2. Number Constantsas distinguishes three kinds of numbers according to how they are stored in the target machine.Integers are numbers that would fit into an int in the C language. Bignums are integers, but they arestored in more than 32 bits. Flonums are floating point numbers, described below.
