Remote-processing BASIC 52 Manual de usuario descargar pdf (Pagina 88)

RPBASIC-52 PROGRAMMING GUIDE

2-69

ONERR

Syntax: ONERR line number

Function: Goes to line number on arithmetic error, b ad argument, and hardw are errors.

Mode: Run

Use: ONERR 1000

Cards: All

DESCRIPTION

The ONER R instruction traps arithmetic errors and hardware problems, transferring control to line number.

ONERR can be used to handle errors generated due to bad user input from and INPUT instruction. ONERR

is a GOTO, not a GOSUB. Consequently, there is no easy way to resume program execution. The control

and argument stacks are cleared so all GOSUB 's, FOR-NEXT loops, etc. are cleared.

Error codes are stored at external memory location 257 (101H) and are accessed using the XBY instruction.

Code Error

0AH (10) DIVIDE BY ZERO

14H (20) ARITH OVERFLOW

1EH (30) ARITH UNDERFLOW

28H (40) BAD ARGUMENT

32H (50) HARDWARE

EXAMPLE

100 ONERR 1000

110 A=1/0

1000 PRINT "Error code:",XBY(257)

>run

Error code: 10

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 162 163

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Remote-processing BASIC 52 Manual de usuario Pagina 88