diff --git a/lib/rpl/types/complex.rb b/lib/rpl/types/complex.rb
index cbe24b2..026fc7c 100644
--- a/lib/rpl/types/complex.rb
+++ b/lib/rpl/types/complex.rb
@@ -10,7 +10,9 @@ module Types
       raise RplTypeError unless self.class.can_parse?( value )
 
       # we systematicalyl trim enclosing ()
-      @value = Complex( value[1..-2] )
+      value = value[1..-2] if value.is_a?( String ) && value[0] == '(' && value[-1] == ')'
+
+      @value = Complex( value )
     end
 
     def to_s
@@ -18,17 +20,16 @@ module Types
     end
 
     def self.can_parse?( value )
-      possibility = value[0] == '(' && value[-1] == ')'
-
-      return possibility unless possibility
+      # we systematicalyl trim enclosing ()
+      value = value[1..-2] if value.is_a?( String ) && value[0] == '(' && value[-1] == ')'
 
       begin
-        Complex( value[1..-2] )
+        Complex( value )
       rescue ArgumentError
-        possibility = false
+        return false
       end
 
-      possibility
+      true
     end
 
     def ==( other )
diff --git a/spec/parser_spec.rb b/spec/parser_spec.rb
index ccbbe93..83dad1e 100644
--- a/spec/parser_spec.rb
+++ b/spec/parser_spec.rb
@@ -39,6 +39,13 @@ class TestParser < MiniTest::Test
     assert_equal BigDecimal( 3 ), result.first.value
   end
 
+  def test_complex
+    result = Parser.parse( '(1+2i)' )
+    assert_equal 1, result.size
+    assert_equal RplComplex, result.first.class
+    assert_equal Complex( 1, 2 ), result.first.value
+  end
+
   def test_word
     result = Parser.parse( 'dup' )
     assert_equal 1, result.size
diff --git a/spec/words_operations-complexes_spec.rb b/spec/words_operations-complexes_spec.rb
new file mode 100644
index 0000000..264cc4d
--- /dev/null
+++ b/spec/words_operations-complexes_spec.rb
@@ -0,0 +1,58 @@
+# coding: utf-8
+# frozen_string_literal: true
+
+require 'minitest/autorun'
+
+require 'rpl'
+
+class TesttLanguageOperations < MiniTest::Test
+  include Types
+
+  def test_re
+    interpreter = Rpl.new
+    interpreter.run '(2+3i) re'
+    assert_equal [Types.new_object( RplNumeric, 2 )],
+                 interpreter.stack
+  end
+
+  def test_im
+    interpreter = Rpl.new
+    interpreter.run '(2+3i) im'
+    assert_equal [Types.new_object( RplNumeric, 3 )],
+                 interpreter.stack
+
+    interpreter = Rpl.new
+    interpreter.run '(2-4i) im'
+    assert_equal [Types.new_object( RplNumeric, -4 )],
+                 interpreter.stack
+  end
+
+  def test_conj
+    interpreter = Rpl.new
+    interpreter.run '(2+3i) conj'
+    assert_equal [Types.new_object( RplComplex, Complex( 2, -3 ) )],
+                 interpreter.stack
+  end
+
+  def test_arg
+    interpreter = Rpl.new
+    interpreter.run '(2+3i) arg'
+    assert_equal [Types.new_object( RplNumeric, 0.982793723247329 )],
+                 interpreter.stack
+  end
+
+  def test_c2r
+    interpreter = Rpl.new
+    interpreter.run '(2+3i) c→r'
+    assert_equal [Types.new_object( RplNumeric, 2 ),
+                  Types.new_object( RplNumeric, 3 )],
+                 interpreter.stack
+  end
+
+  def test_r2c
+    interpreter = Rpl.new
+    interpreter.run '2 -3 r→c'
+    assert_equal [Types.new_object( RplComplex, Complex( 2, -3 ) )],
+                 interpreter.stack
+  end
+end
diff --git a/spec/words_operations_spec.rb b/spec/words_operations-reals-complexes_spec.rb
similarity index 82%
rename from spec/words_operations_spec.rb
rename to spec/words_operations-reals-complexes_spec.rb
index 153d935..7067102 100644
--- a/spec/words_operations_spec.rb
+++ b/spec/words_operations-reals-complexes_spec.rb
@@ -338,102 +338,4 @@ class TesttLanguageOperations < MiniTest::Test
     assert_equal [Types.new_object( RplNumeric, 0 )],
                  interpreter.stack
   end
-
-  def test_percent
-    interpreter = Rpl.new
-    interpreter.run '2 33 %'
-    assert_equal [Types.new_object( RplNumeric, 0.66 )],
-                 interpreter.stack
-  end
-
-  def test_inverse_percent
-    interpreter = Rpl.new
-    interpreter.run '2 0.66 %CH'
-    assert_equal [Types.new_object( RplNumeric, 33 )],
-                 interpreter.stack
-  end
-
-  def test_mod
-    interpreter = Rpl.new
-    interpreter.run '9 4 mod'
-    assert_equal [Types.new_object( RplNumeric, 1 )],
-                 interpreter.stack
-  end
-
-  def test_fact
-    interpreter = Rpl.new
-    interpreter.run '5 !'
-    assert_equal [Types.new_object( RplNumeric, 24 )],
-                 interpreter.stack
-  end
-
-  def test_floor
-    interpreter = Rpl.new
-    interpreter.run '5.23 floor'
-    assert_equal [Types.new_object( RplNumeric, 5 )],
-                 interpreter.stack
-  end
-
-  def test_ceil
-    interpreter = Rpl.new
-    interpreter.run '5.23 ceil'
-    assert_equal [Types.new_object( RplNumeric, 6 )],
-                 interpreter.stack
-  end
-
-  def test_min
-    interpreter = Rpl.new
-    interpreter.run '1 2 min'
-    assert_equal [Types.new_object( RplNumeric, 1 )],
-                 interpreter.stack
-
-    interpreter = Rpl.new
-    interpreter.run '2 1 min'
-    assert_equal [Types.new_object( RplNumeric, 1 )],
-                 interpreter.stack
-  end
-
-  def test_max
-    interpreter = Rpl.new
-    interpreter.run '1 2 max'
-    assert_equal [Types.new_object( RplNumeric, 2 )],
-                 interpreter.stack
-
-    interpreter = Rpl.new
-    interpreter.run '2 1 max'
-    assert_equal [Types.new_object( RplNumeric, 2 )],
-                 interpreter.stack
-  end
-
-  def test_ip
-    interpreter = Rpl.new
-    interpreter.run '3.14 ip'
-    assert_equal [Types.new_object( RplNumeric, 3 )],
-                 interpreter.stack
-  end
-
-  def test_fp
-    interpreter = Rpl.new
-    interpreter.run '3.14 fp'
-    assert_equal [Types.new_object( RplNumeric, 0.14 )],
-                 interpreter.stack
-  end
-
-  def test_mant
-    interpreter = Rpl.new
-    interpreter.run '123.456 mant -123.456 mant 0 mant'
-    assert_equal [Types.new_object( RplNumeric, 0.123456 ),
-                  Types.new_object( RplNumeric, 0.123456 ),
-                  Types.new_object( RplNumeric, 0 )],
-                 interpreter.stack
-  end
-
-  def test_xpon
-    interpreter = Rpl.new
-    interpreter.run '123.456 xpon -123.456 xpon 0 xpon'
-    assert_equal [Types.new_object( RplNumeric, 3 ),
-                  Types.new_object( RplNumeric, 3 ),
-                  Types.new_object( RplNumeric, 0 )],
-                 interpreter.stack
-  end
 end
diff --git a/spec/words_operations-reals_spec.rb b/spec/words_operations-reals_spec.rb
new file mode 100644
index 0000000..b2d6e9f
--- /dev/null
+++ b/spec/words_operations-reals_spec.rb
@@ -0,0 +1,108 @@
+# coding: utf-8
+# frozen_string_literal: true
+
+require 'minitest/autorun'
+
+require 'rpl'
+
+class TesttLanguageOperations < MiniTest::Test
+  include Types
+
+  def test_percent
+    interpreter = Rpl.new
+    interpreter.run '2 33 %'
+    assert_equal [Types.new_object( RplNumeric, 0.66 )],
+                 interpreter.stack
+  end
+
+  def test_inverse_percent
+    interpreter = Rpl.new
+    interpreter.run '2 0.66 %CH'
+    assert_equal [Types.new_object( RplNumeric, 33 )],
+                 interpreter.stack
+  end
+
+  def test_mod
+    interpreter = Rpl.new
+    interpreter.run '9 4 mod'
+    assert_equal [Types.new_object( RplNumeric, 1 )],
+                 interpreter.stack
+  end
+
+  def test_fact
+    interpreter = Rpl.new
+    interpreter.run '5 !'
+    assert_equal [Types.new_object( RplNumeric, 24 )],
+                 interpreter.stack
+  end
+
+  def test_floor
+    interpreter = Rpl.new
+    interpreter.run '5.23 floor'
+    assert_equal [Types.new_object( RplNumeric, 5 )],
+                 interpreter.stack
+  end
+
+  def test_ceil
+    interpreter = Rpl.new
+    interpreter.run '5.23 ceil'
+    assert_equal [Types.new_object( RplNumeric, 6 )],
+                 interpreter.stack
+  end
+
+  def test_min
+    interpreter = Rpl.new
+    interpreter.run '1 2 min'
+    assert_equal [Types.new_object( RplNumeric, 1 )],
+                 interpreter.stack
+
+    interpreter = Rpl.new
+    interpreter.run '2 1 min'
+    assert_equal [Types.new_object( RplNumeric, 1 )],
+                 interpreter.stack
+  end
+
+  def test_max
+    interpreter = Rpl.new
+    interpreter.run '1 2 max'
+    assert_equal [Types.new_object( RplNumeric, 2 )],
+                 interpreter.stack
+
+    interpreter = Rpl.new
+    interpreter.run '2 1 max'
+    assert_equal [Types.new_object( RplNumeric, 2 )],
+                 interpreter.stack
+  end
+
+  def test_ip
+    interpreter = Rpl.new
+    interpreter.run '3.14 ip'
+    assert_equal [Types.new_object( RplNumeric, 3 )],
+                 interpreter.stack
+  end
+
+  def test_fp
+    interpreter = Rpl.new
+    interpreter.run '3.14 fp'
+    assert_equal [Types.new_object( RplNumeric, 0.14 )],
+                 interpreter.stack
+  end
+
+  def test_mant
+    interpreter = Rpl.new
+    interpreter.run '123.456 mant -123.456 mant 0 mant'
+    assert_equal [Types.new_object( RplNumeric, 0.123456 ),
+                  Types.new_object( RplNumeric, 0.123456 ),
+                  Types.new_object( RplNumeric, 0 )],
+                 interpreter.stack
+  end
+
+  def test_xpon
+    interpreter = Rpl.new
+    interpreter.run '123.456 xpon -123.456 xpon 0 xpon'
+    assert_equal [Types.new_object( RplNumeric, 3 ),
+                  Types.new_object( RplNumeric, 3 ),
+                  Types.new_object( RplNumeric, 0 )],
+                 interpreter.stack
+  end
+end