Class ConversionSyntax

              object --+                        
                       |                        
exceptions.BaseException --+                    
                           |                    
        exceptions.Exception --+                
                               |                
        exceptions.StandardError --+            
                                   |            
          exceptions.ArithmeticError --+        
                                       |        
                        DecimalException --+    
                                           |    
                            InvalidOperation --+
                                               |
                                              ConversionSyntax

Trying to convert badly formed string.

This occurs and signals invalid-operation if an string is being converted to a number and it does not conform to the numeric string syntax. The result is [0,qNaN].