nobu	2018-11-17 10:21:18 +0900 (Sat, 17 Nov 2018)

  New Revision: 65773

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65773

  Log:
    [DOC] rational and imaginary literals [ci skip]

  Modified files:
    trunk/doc/syntax/literals.rdoc
Index: doc/syntax/literals.rdoc
===================================================================
--- doc/syntax/literals.rdoc	(revision 65772)
+++ doc/syntax/literals.rdoc	(revision 65773)
@@ -71,6 +71,33 @@ Examples: https://github.com/ruby/ruby/blob/trunk/doc/syntax/literals.rdoc#L71
 All these numbers have the same decimal value, 170.  Like integers and floats
 you may use an underscore for readability.
 
+=== Rational numbers
+
+Numbers suffixed by +r+ are Rational numbers.
+
+  12r         #=> (12/1)
+  12.3r       #=> (123/10)
+
+Rational numbers are exact, whereas Float numbers are inexact.
+
+  0.1r + 0.2r #=> (3/10)
+  0.1 + 0.2   #=> 0.30000000000000004
+
+=== Complex numbers
+
+Numbers suffixed by +i+ are Complex (or imaginary) numbers.
+
+  1i          #=> (0+1i)
+  1i * 1i     #=> (-1+0i)
+
+Also Rational numbers may be imaginary numbers.
+
+  12.3ri      #=> (0+(123/10)*i)
+
++i+ must be placed after +r+, the opposite is not allowed.
+
+  12.3ir      #=> syntax error
+
 == Strings
 
 The most common way of writing strings is using <tt>"</tt>:

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