Class CX_FORMULA - Constants

• numeric constants (without dimensions) are either integer or real numbers, while - like in all programming languages - decimal places are separated from the integer fraction via point: example 2.71828
  
• a unit follows for dimensioned numeric constants, example 2.37cm
  In case the measuring unit is a quotient, it needs to be put in brackets - example 2.5 [cm/g] - since otherwise, the denominator measuring unit would be considered as a variable (in 2.5cm/g as variable g, to divide the value).
  Some measuring units have different names in different languages; constants with units adjust to the current language.
  
• Enumeration constants are identified in the formula expression due to context, when  they are connected to a data field via comparison operator, for which an enum transformation table needs to be defined for the ClassiX^® system, like in example bf = on both sides.   skonstanten werden aus dem Kontext im Formelausdruck erkannt, wenn sie durch einen Vergleichsoperator mit einem Datenfeld verbunden sind, für das im ClassiX^®-System eine Enum-Transformationstabelle definiert ist, wie im Beispiel  bf = beidseitig.
  In case an enumeration constant cannot be identified implicitly, it needs to be referred explicitly to the data field that defines the translation table:        Foo() = bf::on both sides - with the scope operator ::, the data field name is prepended. Enumeration names that don't conform with identifier  syntax, have to be quoted: bf = "both sides".
  Names of an enumeration constant almost always depend on the language. Therefore, formula expressions are modified according to the current language setting. 
  
• Implicitly identified constants are:
  

  Name	Value	Class
  pi	3.14159265	CX_NUMERIC
  e	2,71828182	CX_NUMERIC
  true	1	CX_BOOLEAN
  false	0	CX_BOOLEAN

Furthermore, names of data types, defined in InstantView^®, all classes that are known in ClassiX^®  included, can be used as numeric constants. These values are required for example in connection with the functions type and inherited.

• Strings are in quotation marks: "this is a string"
• The following functions Certain constants can be obtained with the following functions that receive strings as parameters:  xx with the following functions Bestimmte Konstanten erhält man durch folgende Funktionen, denen als Parameter eine Zeichenkette übergeben wird:
  

  Function	results are objects of the class...	Examples
  Date(...)	CX_DATE	Date("24.12.1900") Date("today")
  SpanDate(...)	CX_SPAN_DATE	SpanDate("3.1.1999 - 23.2.1999")
  Time(...)	CX_TIME	Time("12.00")  Time("now")
  BitPattern(...)	CX_BIT_PATTERN	BitPattern("1011011101")