Basic program in EGL source format

An example of a basic program is as follows:

program myCalledProgram type basicProgram
  (buttonPressed int, returnMessage char(25))
    
    function main()
    returnMessage = "";
    if (buttonPressed = 1)
      returnMessage = "Message1";
    end

      if (buttonPressed = 2)
      returnMessage = "Message2";
    end
    end
end

The syntax diagram for a program part of type basicProgram is as follows:

Program programPartName ... end

Identifies the part as a program part and specifies the name and type. If the program name is followed by a left parenthesis, the program is a called basic program.

If you do not set the alias property (as described later), the name of the generated program is programPartName.

For other rules, see Naming conventions.

mainBasicProperties

The properties for a main basic program are optional:

• alias

• allowUnqualifiedItemReferences

• includeReferencedFunctions

• inputRecord

• msgTablePrefix

For details, see Program properties.

parameter

Specifies the name of a parameter, which may be a data item, record, or form; or a dynamic array of records or data items. For rules, see naming conventions.

If the caller's argument is a variable (not a constant or literal), any changes to the parameter change the area of memory available to the caller.

Each parameter is separated from the next by a comma. For other details, see Program parameters.

calledProperties

The called properties are optional:

• alias

• allowUnqualifiedItemReferences

• includeReferencedFunctions

• msgTablePrefix

For details, see Program properties.

programData

Variable and use declarations, as described in Program data other than parameters.

mainFunctionPart

A required function named main, which takes no parameters. (The only program code that can take parameters is the program itself and functions other than main.)

For details on writing a function, see Function part in EGL source format.

functionPart

An embedded function, which is private to this program. For details on writing a function, see Function part in EGL source format.

Related concepts
EGL projects, packages, and files
Overview of EGL properties and overrides
Parts
Program part
Syntax diagram

Related reference
EGL source format
Function part in EGL source format
Naming conventions
Program data other than parameters
Program parameters
Program part in EGL source format
Program part properties
Use declaration