HP 3000 Manuals

VIRTUOSO CODE GENERATOR Reference Manual

#let 

Assigns a value to a keyword.

Syntax 

              {value     }
#let keyword= {expression}

Keywords 

keyword          is the keyword which is to be assigned a value.  The
                 keyword must conform to the naming restrictions.  See
                 Chapter 2 for keyword naming restrictions.

value            is the value to be assigned to a keyword.  This can be a
                 literal value or a keyword whose value is to be
                 assigned (i.e., #let keyword1= "!keyword2" or #let
                 keyword1=keyword2).  If the literal value is a string,
                 the literal must be enclosed in quotes (").  If the
                 literal itself contains quotes, enclose it in single
                 quotes (') instead.

expression       is the expression to be evaluated to assign a value to a
                 keyword.  Any valid arithmetic expression can be used
                 (+,-,*,/).  The precedence for these operators is the
                 same as for COBOL operations, i.e.  (, /*, +-.

Description 

The #let construct assigns a value or expression to a keyword.  The
keyword that is assigned a value can be a new keyword (introduced for the
first time) or an existing keyword whose value is to be modified.  Both
new and existing keywords can be assigned a value in the current scope.
If the keyword is new, its value is accessible from the current scope or
inner scopes.  For example, a keyword introduced in a model is accessible
in a macro invoked by the model.  Refer to the #returnvalue construct for
information on assigning a value to a keyword in a previous scope.

After you assign a value or expression to a keyword, the value can be
accessed by referencing the name of the keyword preceded by the
substitution character

Examples 

EXAMPLE 1

     #let element="product-no"
       .
       .
        MOVE !element TO DB-KEY.

The above example illustrates the use of literal value assignment.
Notice that the literal is enclosed in quotes since it is a string.  The
value assigned to the keyword is later accessed with the !element 
reference.

     EXAMPLE 2

     #let image-password="!creator-pass"

This example illustrates the assignment of the value of one keyword to
another keyword.  The value of the keyword creator-pass is assigned to
the keyword image-password.  The following example performs the same
assignment:

     #let image-password = creator-pass

EXAMPLE 3

     #let A=5
     #let B=6
     #let C=A*B/2

This example shows a series of expressions assigned to keywords.  In this
example, the keyword "C" will have a value of 15.

MPE/iX 5.0 Documentation