SIMSCRIPT II.5 Programming Language

SIMSCRIPT II.5 Programming Language
if I eq N.DATASET+1
create a SAMPLE called S
file S last in DATASET
else
let S = F.DATASET
for J = 1 to I-1,
let S = S.DATASET(S)
always
let VALUE(S) = A
return
end
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6.11 Monitored Variables
Thus far, program names representing data values have had either memory locations or routines associated
with them. Names defined as variables referred to values stored in computer words.
Names defined as functions referred to values computed or stored by associated programs.
A new data type, a monitored variable, has both a storage location and a function routine associated
with it. The statements required to define and use monitored variables parallel the statements required
to define variables and functions and to implement left-handed functions.
Any variable, array, or attribute is defined as monitored by a statement of the form:
or
or
define name as a variable monitored on the left
define name as a variable monitored on the right
define name as a variable monitored on the right and left
The word the before right and left is optional.
Because monitored variables have data values as well as routines associated with them, mode and
dimensionality declarations can also be included, as in:
define X as a real, 2-dimensional array monitored
on left and right
Monitoring on the right and on the left is obtained through function routines similar to right- and
left-handed functions. If a variable is declared as monitored on the right (or left), a right-handed (or
left-handed) monitoring routine must be provided. A routine is able to perform a monitoring function
by the inclusion of one new executable statement. The statement differs, depending on whether
the routine is right- or left-handed.
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