ERR and ERL return the error code and the line number at which the error occurred respectively.
10 GOTO 50 20 A = ERR 30 PRINT "Error Number";A;"at line";ERL 50 ON ERROR GOTO 20 60 B=A/0 70 STOP
This example prints:
Error Number 6 at line 60
due to the floating point error caused by an attempt to divide by zero.
ERR and ERL will always contain the codes of the last error, and will often be used in conjunction with ERROR.
These functions are often used in communications with the ON ERROR trap.
See Errors And Warnings for actual error numbers.
ERR defaults to zero until an error occurs.