Sharp OZ-707 Operation Manual - Page 71

Sharp OZ-707 - Scientific Rom Card Manual

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ERL p o FORMAT: ERL Abbreviation: See Also: ERN, ON ERROR GOTO PURPOSE: Returns the line number at which an error occurred during program execution. REMARKS: The ERL function is used with the ERN function and the ON ERROR GOTO statement in error processing routines to control program flow when an error occurs. A line number is only set in ERL if the error occurred during program execution. ERL will be cleared when • a RUN statement is executed. • the power is turned off. • a program is loaded. ERN P D FORMAT: ERN Abbreviation: See Also: ERL, ON ERROR GOTO PURPOSE: Returns the error code number of the execution error. REMARKS: The ERN function is used with the ERL function and the ON ERROR GOTO statement in error processing routines to control program flow when an error occurs. See Appendix A for a list of error messages. ERN will be cleared when • a RUN statement is executed. • the power is turned off. • a program is loaded. EXAMPLE: 10: ON ERROR GOTO 100:WAIT 20: FOR N = 1 TO 20 30: READ A 40: PRINT A 50: NEXT N 60: END 100: IF ERL = 30 AND ERN = 53 THEN PRINT "YOU HAVE NO DATA" 130 131

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ERL
FORMAT:
ERL
Abbreviation:
See
Also:
ERN, ON ERROR GOTO
PURPOSE:
Returns the line number at which
an
error occurred during program
execution.
REMARKS:
The ERL function is used with the ERN function and the
ON
ERROR
GOTO statement
in
error processing routines to control program flow
when an error occurs. A line number is only set
in
ERL if the error
occurred during program execution.
ERL will be cleared when
• a RUN statement is executed.
• the power is turned off.
• a program is loaded.
130
p
o
E
RN
FORMAT:
ERN
Abbreviation:
See
Also:
ERL, ON ERROR GOTO
PURPOSE:
Returns the error code number of the execution error.
REMARKS:
The ERN function is used with the ERL function and the ON ERROR
GOTO statement
in
error processing routines to control program flow
when an error occurs.
See Appendix A for a list of error messages.
ERN will
be
cleared when
• a RUN statement is executed.
• the power is turned off.
• a program is loaded.
EXAMPLE:
10
:
ON
ERROR GOTO 100:WAIT
20
:
FOR
N
=
1 TO
20
30: READ A
40: PRINT A
50
: NEXT N
60:
END
100
:
IF
ERL
=
30 AND
ERN
=
53 THEN PRINT "YOU HAVE
NO
DATA"
131
P
D