Test integerness: Difference between revisions

Content added Content deleted

Inline

@@ Line 1,306: / Line 1,306: @@
 =={{header|Ruby}}==
-{{improve|Ruby|This method appears to support arbitrarily large floats, as well as special float values like NaN and infinity, but doesn't demonstrate it. Some test-cases should probably be added. (See the recommended test-cases in the task description.)}}
 Testing for integerness of floats, rationals and complex numbers:
@@ Line 1,314: / Line 1,312: @@
   def integer?
     self == self.to_i rescue false
-  end
+   end
 end
 # Demo
-ar = [2.0, 2.5,              # 2 floats
+ar = [25.000000, 24.999999, 25.000100, -2.1e120, -5e-2,
-.to_r, 2.5.to_r,      # 2 rationals
+      Float::NAN, Float::INFINITY,
-.to_c, 2+0.5i]        # 2 complex numbers
+r, 2.5r,      # rationals
++0i, 2 + 0.0i, 5-5i]
 ar.each{|num| puts "#{num} integer? #{num.integer?}" }
 </lang>
 {{out}}
 <pre>
 .0 integer? true
-.5 integer? false
+.999999 integer? false
+.0001 integer? false
+-2.1e+120 integer? true
+-0.05 integer? false
+NaN integer? false
+Infinity integer? false
 /1 integer? true
 /2 integer? false
 +0i integer? true
-+0.5i integer? false
++0.0i integer? false
+-5i integer? false
 </pre>
+Ruby considers 2+0.0i to be inexact and raises an exception when the to_i method attempts to convert it to an integer. 2+0i is exact and converts to integer.
 =={{header|Tcl}}==