As GC Wizard Script regards all data objects as dynamic, i.e. the type of a data object can change at runtime, the following routines are available for checking a data type:

• ISNUMBER – checks whether a variable represents a number
• ISINT – checks whether a variable represents a natural number
• ISDOUBLE – checks whether a variable represents a real number
• ISCHAR – checks whether a variable represents a character
• ISSTRING – checks whether a variable represents a character string
• ISLIST – checks whether a variable represents a list