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Programming Ruby The Pragmatic Programmer's Guide |
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class Fixnum
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Parent:
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Integer
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Version:
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1.6
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Index:
Arithmetic operations
Bit operations
<=>
[ ]
id2name
size
to_f
to_i
to_s
A Fixnum holds Integer values that can be represented in a
native machine word (minus 1 bit). If any operation on a Fixnum exceeds this range, the value is automatically converted
to a Bignum.
Fixnum objects have immediate value.
This means that when they
are assigned or passed as parameters, the actual object is passed,
rather than a reference to that object. Assignment does not alias Fixnum objects. There is effectively only one Fixnum
object instance for any given integer value, so, for example, you
cannot add a singleton method to a Fixnum.
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instance methods
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Arithmetic operations
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Performs various arithmetic operations on fix.
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fix
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+ |
aNumeric
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Addition |
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fix
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-- |
aNumeric
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Subtraction |
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fix
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* |
aNumeric
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Multiplication |
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fix
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/ |
aNumeric
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Division |
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fix
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% |
aNumeric
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Modulo |
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fix
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** |
aNumeric
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Exponentiation |
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Bit operations
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Performs various operations on the binary representations of the Fixnum.
| ~ fix
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Invert bits |
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fix
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aNumeric
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Bitwise OR
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fix
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& |
aNumeric
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Bitwise AND
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fix
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^ |
aNumeric
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Bitwise EXCLUSIVE OR
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fix
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<< |
aNumeric
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Left-shift aNumeric bits |
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fix
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>> |
aNumeric
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Right-shift aNumeric
bits (with sign extension) |
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<=>
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fix <=> aNumeric
-> -1, 0, +1
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Comparison---Returns -1, 0, or +1 depending on whether fix is less
than, equal to, or greater than aNumeric. This is the
basis for the tests in Comparable.
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[ ]
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fix[ n ] -> 0, 1
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Bit Reference---Returns the nth bit in the binary
representation of fix, where fix[0] is the least significant
bit.
a = 0b11001100101010
30.downto(0) do |n| print a[n] end
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produces:
0000000000000000011001100101010
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id2name
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fix.id2name -> aString or nil
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Returns the name of the object whose symbol
id is the value of fix. If there is no symbol in the symbol
table with this value, returns nil. id2name has nothing to do with the Object.id
method. See also
String#intern
on page 371 and class Symbol on page 383.
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symbol = :@inst_var
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:@inst_var
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id = symbol.to_i
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9002
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id.id2name
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"@inst_var"
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size
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fix.size -> aFixnum
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Returns the number of bytes in the machine representation
of a Fixnum.
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to_f
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fix.to_f -> aFloat
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Converts fix to a Float.
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to_i
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fix.to_i -> fix
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Returns fix.
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to_s
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fix.to_s -> aString
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Returns a string containing the decimal representation of self.
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Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"
Copyright
©
2001 by Addison Wesley Longman, Inc. This material may
be distributed only subject to the terms and conditions set forth in
the Open Publication License, v1.0 or later (the latest version is
presently available at http://www.opencontent.org/openpub/)).
Distribution of substantively modified versions of this document is
prohibited without the explicit permission of the copyright holder.
Distribution of the work or derivative of the work in any standard
(paper) book form is prohibited unless prior permission is obtained
from the copyright holder.
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