LogiView

Function 'known'

     
Use this function to check if a value has already been assigned to the specified variable. If a value has been assigned, the function returns TRUE; otherwise a logical FALSE is returned.

Use this function to check if a variable has been initialized (the variable works like a flag).

 

Syntax:

  {LOG_VAR}= known({VAR})
 

I/O parameters:

{VAR} Variable to be checked
-  
 

Return value:

 
{LOG_VAR}
TRUE Variable has been initialized with a value.
FALSE Variable not yet initialized.
 

Example:

  Declaration of Variables
 
 10 DOCU_STRING_1="abc"	
 20 if (known(DOCU_STRING_1)== TRUE)	
 30   put("Variable is initialized!")	
 40 else	
 50   DOCU_STRING_1="abc"	
 60 endif
  Result:
 

Functions and commands: Miscellaneous