Returns the number of a line in which an error has been generated.
ER = ERL
The value of ERL can only be changed within a program, and the value is cleared
when a program is executed or when the power of the unit is switched OFF.
10  ON ERROR GOTO 40
20  **ERROR**
30  END
40  PRINT "ERROR LINE="; ERL
50  RESUME 30
Error is generated in line 20 line mumber where the error was generated is displayed in line 40.