ERROR - DualBrain/bsharp GitHub Wiki

To simulate the occurrence of an error, or to allow the user to define error codes.

Syntax

ERROR integer expression

Comments

The value of integer expression must be greater than 0 and less than 255. If the value of integer expression equals an error code already in use by BASIC, the ERROR statement simulates the occurrence of that error, and the corresponding error message is printed.

A user-defined error code must use a value greater than any used by the BASIC error codes. There are 76 BASIC error codes at present. It is preferable to use a code number high enough to remain valid when more error codes are added to BASIC.

User-defined error codes may be used in an error-trapping routine.

If an ERROR statement specifies a code for which no error message has been defined, BASIC responds with the message Unprintable Error.

Execution of an ERROR statement for which there is no error-trapping routine causes an error message to be printed and execution to halt.

For a complete list of the error codes and messages already defined in BASIC, refer to Appendix A in the BASIC User's Guide.

Examples

The following examples simulate error 15 (the code for String too long):

10 S=10
20 T=5
30 ERROR S + T
40 END

 String too long in 30

The following example includes a user-defined error code message.

110 ON ERROR GOTO 400
120 INPUT "WHAT IS YOUR BET";B
130 IF B>5000 THEN ERROR 210
400 IF ERR=210 THEN PRINT "HOUSE LIMIT IS $5000"
410 IF ERL=130 THEN RESUME 120