Using the CALLP Operation

You use the CALLP (Call a Prototyped procedure) operation to call a prototyped program or procedure written in any language. The CALLP operation uses the following extended-factor 2 syntax:

     C                   CALLP     NAME{ (PARM1 {:PARM2 ...}) }

In free-form calculations, you can omit CALLP if there are no operation extenders. The free-form operation can use either of the following forms:

      /free
          callp name { (parm1 { :parm2 ...} ) };
          name( {parm1 {:parm2 ... }} );
      /end-free

To call a prototyped program or procedure follow these general steps:

1. Include the prototype of the program or procedure to be called in the definition specifications. This step is optional if the procedure is in the same module as the call, and there are no other modules that call the procedure.
2. Enter the prototype name of the program or procedure in the extended Factor-2 field, followed by the parameters if any, within parentheses. Separate the parameters with a colon (:). Factor 1 must be blank.

The following example shows a call to a procedure Switch, which changes the state of the indicator that is passed to it, in this case *IN10..

     C                   CALLP     Switch(*in10)