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RASExpress User Guide

152 CommPlete Communications Server

c The argument is a character. If the corresponding argument is an integer the value

of the argument modulo 256 is taken and copied; if the argument is real it is

ignored and ‘0’ is copied; if the argument is a string the first character of the string

is copied.

% A % is copied to the output stream. If the character following % is not %, the % as

well as the following character are copied to the output stream.

Script Language Execution Notes

Execution starts at the PROC main. PROC main cannot have any arguments. All

variables must be declared before they are used. All procedures must be declared

before they are called. Recursion is allowed in procedures.

To define mutually recursive procedures, use the FORWARD directive to indicate

that the procedure body is defined later in the source file. Procedures defined with

the FORWARD directive should have all the parameters and return value (if any)

specified; the actual definition of the procedure body should not contain the formal

parameter list or the return value. Example of forward-defined procedures:

Example

proc a(integer x, y) : integer;

forward;

proc b(integer u, v) : integer;

forward;

proc a;

integer t;

/* Some more code here. */

t = b(x, y);

/* Some more code here. */

return(t);

endproc

proc b;

return(a(u, v));

endproc

Operator Precedence

Operators are listed in the order of precedence :

Unary Operators : - ! (unary minus, logical negation)

Binary Operators : * / + - < > <= >= == != && ||

All operators are left-associative. Expressions are evaluated completely, so care must

be taken when writing expressions. For example, an expression like

(a != 0 && b / a) would create a run-time error.

Creating, Compiling, and Executing a Script File

This section provides the basic information necessary to create, compile, and execute

(run) a script file for RASExpress.

Creating a Script File

A script file can be created using a text editor or a screen snapshot that contains

RASExpress script language commands. This file is the source code and should be

saved with a .SCR extension.

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