Introduction

V+ Language Reference Guide, v17.x

Introduction to System Messages

While the V+ system is being used, it is possible for hardware and software errors to occur. For example, if commands or instructions are not entered in the correct way, V+ rejects the input. The usual response is to write an error message to the system terminal indicating what is wrong so that you can correct the error. In addition to error messages, V+ can also issue warning or informational messages.

In V+, each error message is normally assigned an error number (or code) and an associated error string. The following numbering conventions are used to identify the type of system message generated:

Informational Messages (numbers 0-49) lists messages that provide information.

Warning Messages (number 50-299) lists warning messages that you may receive.

Error Messages (numbers -300 to -1300) lists the error messages that you may receive.

Most message codes associated with errors can be made available to a program by the ERROR function, which returns the code of the latest error that occurred. In addition, the $ERROR function returns the error message associated with any V+ error code.

Documentation

The V+ system message documentation allows you to look up the details on an error message either alphabetically by the first character of the message string, or numerically by the system code. For details, see Related Topics.

For each message, the documentation includes the message code, the text of the message, and sometimes a comment about the applicability of the message. Angle brackets (<...>) are used to enclose a description of an item that appears in that position. All numbers are decimal.

Updates

Changes to V+ system messages are summarized in the V+ Release Notes.

Related Topics

Alphabetical List of V+ System Messages

Numerical List of V+ System Messages

ERROR real-valued function

$ERROR string function