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Left Hand Pointer


M[UMPS] by Example

Right Hand Pointer

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

Read "Please enter your name: ",NAME
Write "Please enter your name: " Read NAME

Both lines of code seemingly have the same effect. On some implementations, the former example has the side-effect to flush the type-ahead buffer.

Read X#20
Read a string of fixed length (do not wait for a terminator).

Read X:20
Read a string. When a 'terminator' key is pressed, the Read command will be satisfied. If, after 20 seconds, no 'terminator' key has been pressed, the Read command will also be satisfied. In this case, the value returned in X is 'as many characters as have been entered before the time-out elapsed'.

Read *X:20
Read a single character. The value returned in X will be an integer number. If the time-out expires, this value will be –1.

Addition in the 1984 ANSI M[UMPS] language standard.

Read X#1
Read *X

Both lines of code read one single character. The first line always returns a string of length 1 in local variable X. The second line returns an integer value in local variable X; although practically all implementations return the ASCII code of the character processed, the value returned in local variable X is implementation-specific and device specific and it is not to be considered portable to rely on a specific value being returned.

Addition in the 1995 ANSI M[UMPS] language standard.

Read ^ABC
It is allowed to read values directly into global variables.

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

The ability to specify an "output time-out" is added. An output time-out is specified as a device parameter in an OPEN or USE command. Examples are shown with the Use command.

User-definable I/O handling has been added. When user-definable I/O handling is active:

Examples with naked references:

Set ^ABC(1,2)="reset naked indicator"
; naked indicator is now ^ABC(1,
Read ^(3,4)

; naked indicator is now: ^ABC(1,3,
; Actual reference is: ^ABC(1,3,4)

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.

The information in this page is NOT authoritative and subject to be modified at any moment.
Please consult the appropriate (draft) language standard for an authoritative definition.

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, 10:17:06 .

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