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<ppdoc>
<copyright>
Copyright (c) 2001 by Addison Wesley Longman. 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/).
</copyright>
<class name="Integer" super="Numeric" type="class"> <subclasses>Bignum, Fixnum</subclasses>
<p/>
<classname>Integer</classname> is the basis for the two concrete classes that hold
whole numbers, <classname>Bignum</classname> and <classname>Fixnum</classname>.
<p/>
<methods type="instance">
<method name="chr" ref="chr">
<callseq>
<obj>int</obj>.chr <returns><obj>aString</obj></returns>
</callseq>
<desc>
<p/>
Returns a string containing the ASCII character represented by
the receiver's value.
<p/>
<codefragment>
<fullcode><![CDATA[ 65.chr
?a.chr
230.chr
]]></fullcode><rubycode>
<tr>
<td><tt>65.chr</tt></td>
<td>»</td>
<td><tt>"A"</tt></td>
</tr>
<tr>
<td><tt>?a.chr</tt></td>
<td>»</td>
<td><tt>"a"</tt></td>
</tr>
<tr>
<td><tt>230.chr</tt></td>
<td>»</td>
<td><tt>"\346"</tt></td>
</tr>
</rubycode>
<p/>
</codefragment>
<p/>
</desc>
</method>
<p/>
<method name="downto" ref="downto">
<callseq>
<obj>int</obj>.downto( <obj>anInteger</obj> ) <block>{| i | <blockbody>block</blockbody> }</block>
<p/>
<returns><obj>int</obj></returns>
</callseq>
<desc>
<p/>
Iterates <em>block</em>, passing decreasing values
from <obj>int</obj> down to and including <obj>anInteger</obj>.
<p/>
<codefragment>
<alltt><fullcode><![CDATA[ 5.downto(1) { |n| print n, ".. " }
print " Liftoff!\n"
]]></fullcode>
5.downto(1)<nbsp/>{<nbsp/>|n|<nbsp/>print<nbsp/>n,<nbsp/>"..<nbsp/>"<nbsp/>}
print<nbsp/>"<nbsp/><nbsp/>Liftoff!\n"
</alltt>
</codefragment>
<em>produces:</em>
<codefragment><alltt>
5..<nbsp/>4..<nbsp/>3..<nbsp/>2..<nbsp/>1..<nbsp/><nbsp/><nbsp/>Liftoff!
</alltt>
</codefragment>
<p/>
</desc>
</method>
<p/>
<method name="integer?" ref="integer_qm">
<callseq>
<obj>int</obj>.integer? <returns><const>true</const></returns>
</callseq>
<desc>
<p/>
Always returns <const>true</const>.
<p/>
</desc>
</method>
<p/>
<method name="next" ref="next">
<callseq>
<obj>int</obj>.next <returns><obj>anInteger</obj></returns>
</callseq>
<desc>
<p/>
Returns the <classname>Integer</classname> equal to <obj>int</obj><nbsp/>+<nbsp/>1.
<p/>
<codefragment>
<fullcode><![CDATA[ 1.next
(-1).next
]]></fullcode><rubycode>
<tr>
<td><tt>1.next</tt></td>
<td>»</td>
<td><tt>2</tt></td>
</tr>
<tr>
<td><tt>(-1).next</tt></td>
<td>»</td>
<td><tt>0</tt></td>
</tr>
</rubycode>
<p/>
</codefragment>
<p/>
</desc>
</method>
<p/>
<method name="step" ref="step">
<callseq>
<obj>int</obj>.step( <obj>endNum</obj>, <obj>step</obj> ) <block>{| i | <blockbody>block</blockbody> }</block>
<p/>
<returns><obj>int</obj></returns>
</callseq>
<desc>
<p/>
Invokes <em>block</em> with the sequence of numbers starting at
<obj>int</obj>,
incremented by <obj>step</obj> on each call. The loop
finishes when the value to be passed to the block is greater
than <obj>endNum</obj> (if <obj>step</obj> is positive) or less than
<obj>endNum</obj> (if <obj>step</obj> is negative).
<p/>
<codefragment>
<alltt><fullcode><![CDATA[ 1.step(10, 2) { |i| print i, " " }
!- print "\n"
]]></fullcode>
1.step(10,<nbsp/>2)<nbsp/>{<nbsp/>|i|<nbsp/>print<nbsp/>i,<nbsp/>"<nbsp/>"<nbsp/>}
</alltt>
</codefragment>
<em>produces:</em>
<codefragment><alltt>
1<nbsp/>3<nbsp/>5<nbsp/>7<nbsp/>9
</alltt>
</codefragment>
<p/>
</desc>
</method>
<p/>
<method name="succ" ref="succ">
<callseq>
<obj>int</obj>.succ <returns><obj>anInteger</obj></returns>
</callseq>
<desc>
<p/>
Synonym for <cim><file>integer</file><front>Integer</front><back>next</back><mref>next</mref></cim>.
<p/>
</desc>
</method>
<p/>
<method name="times" ref="times">
<callseq>
<obj>int</obj>.times <block>{| i | <blockbody>block</blockbody> }</block>
<p/>
<returns><obj>int</obj></returns>
</callseq>
<desc>
<p/>
Iterates block <obj>int</obj> times, passing in values from zero to
<obj>int</obj> - 1.
<p/>
<codefragment>
<alltt><fullcode><![CDATA[ 5.times do |i|
print i, " "
end
print "\n"
]]></fullcode>
5.times<nbsp/>do<nbsp/>|i|
<nbsp/><nbsp/>print<nbsp/>i,<nbsp/>"<nbsp/>"
end
print<nbsp/>"\n"
</alltt>
</codefragment>
<em>produces:</em>
<codefragment><alltt>
0<nbsp/>1<nbsp/>2<nbsp/>3<nbsp/>4
</alltt>
</codefragment>
<p/>
</desc>
</method>
<p/>
<method name="upto" ref="upto">
<callseq>
<obj>int</obj>.upto( <obj>anInteger</obj> ) <block>{| i | <blockbody>block</blockbody> }</block>
<p/>
<returns><obj>int</obj></returns>
</callseq>
<desc>
<p/>
Iterates <em>block</em>, passing in integer values from
<obj>int</obj> up to and including <obj>anInteger</obj>.
<p/>
<codefragment>
<alltt><fullcode><![CDATA[ 5.upto(10) { |i| print i, " " }
!- print "\n"
]]></fullcode>
5.upto(10)<nbsp/>{<nbsp/>|i|<nbsp/>print<nbsp/>i,<nbsp/>"<nbsp/>"<nbsp/>}
</alltt>
</codefragment>
<em>produces:</em>
<codefragment><alltt>
5<nbsp/>6<nbsp/>7<nbsp/>8<nbsp/>9<nbsp/>10
</alltt>
</codefragment>
<p/>
</desc>
</method>
<p/>
</methods>
<p/>
</class>
</ppdoc>
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