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Left Hand Pointer

expr

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Right Hand Pointer

expr

Introduced in the 1977 ANSI M[UMPS] language standard.

This metalanguage symbol represents an expression. An expression (formula) starts with a basic value denoting object (expratom). Optionally, there may be more. If there is, first comes a (binary) operator, and then another basic value denoting object. The binary operator, in some cases, may be negated by a not sign ('). This additional part is called an exprtail. An expression may have any number of exprtails.

exprtail

Introduced in the 1977 ANSI M[UMPS] language standard.

This metalanguage symbol represents the tail end of an expression. (See the metalanguage symbol expr).

logicalop

Introduced in the 1977 ANSI M[UMPS] language standard.

This metalanguage symbol represents any of the logical binary operators, i.e. one of ! or &.

Approved for addition in a future M[UMPS] language standard.

The logical operator !! (exclusive or) is added to the list of possible operators.

truthop

Introduced in the 1977 ANSI M[UMPS] language standard.

This metalanguage symbol represents any of the relational binary operators (i.e. one of =, <, >, [ or ]) or any of the logical binary operators, (i.e. one of !, or &).

Button for 1977 Button for 1984 Button for 1990 Button for 1995 Button for MDC Button for notes Button for examples

Copyright © Standard Documents; 1977-2018 MUMPS Development Committee;
Copyright © Examples: 1995-2018 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2018 Ed de Moel.

Some specifications are "approved for inclusion in a future standard". Note that the MUMPS Development Committee cannot guarantee that such future standards will indeed be published.

This page most recently updated on 13-Sep-2014, 17:32:59 .

For comments, contact Ed de Moel (demoel@jacquardsystems.com)