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Chapter 8 PAC Language Syntax

8-25

8.16 Calling with a Value and with Reference

It may be desired to pass data to a program when another program is called

from the current program. In this case the data can be passed by adding an

argument list after by the program name to be called. “Calling with a value”

directly passes a value while “calling with reference” passes variables using an

argument passing method.

The commands to call a program are CALL and RUN. For the CALL

command, both calling methods can be used, however, for the RUN command,

only “calling with a value” can be used.

The type of argument passed to a program must match that of the argument

described in the program to be called. Therefore, if a constant is passed, a

type declaration character must be added. And in the program to be called, a

type declaration character must be added to the argument name because the

argument is declared as a local variable.

8.16.1 Calling with a Value

When constants are passed, expressions and character strings always use

values. If a variable is enclosed in parenthesis, it is regarded as an

expression. Thus, even a variable can be passed with a value.

Example: Method of calling a program PROGRAM SUB1 (AA#).

• If a variable is passed as a value CALL SUB1 ( (D1) )

• If a constant is passed CALL SUB1 (10#)

• If an expression is passed CALL SUB1 (D1 + D2)

Note 1: When a variable is passed as a value, calling with a value of

the entire array is impossible. If you write such a calling, it

will be processed as "calling with reference."

Note 2: When an expression is passed, note the type of the result of

the expression. It must be the same as the type of the

argument of the program to be called.

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