to_f and to_c methods

Author: rajithv

lib/symengine/complex_double.rb

@@ -1,7 +1,7 @@
 module SymEngine
   class ComplexDouble
     def to_c
-        to_s.to_c
+        to_s.tr('I', 'i').delete(" *").to_c
     end
   end
 end 

lib/symengine/real_double.rb

@@ -1,7 +1,7 @@
 module SymEngine
   class RealDouble
     def to_f
-        to_s.to_f
+        self.to_s.to_f
     end
   end
-end 
+end