Toshiba STE 58762 instruction manual STE Subprograms, － 2-22 －

STE 58762

2.8.2 Subprograms

You can call up a subprogram by just writing its name in the main program.

Example:

Here is a main program which calls a subprogram called SUB1.

PROGRAM MAIN

REMARK *** SAMPLE 1 ***

SUB1

END

Here is the subprogram which has been named SUB1.

PROGRAM SUB1

REMARK *** SUBPROGRAM NO. 1 ***

Body of subprogram

RETURN

END

A RETURN command should inserted in subprograms to send control back to the main program. If you forget to write RETURN, SCOL will forgive you and pretend that there is a RETURN command in front of the END statement.

When wishing to pass data between subprograms and the main program, you have to first specify arguments for the subprogram. Arguments are like little "mailboxes" to which values passed between the programs are sent and received. And, before using these mailboxes, you have to put a name on each one so the postman knows whose mail goes where. When writing a subprogram (not a main program), the program statement should be written like this:

PROGRAM <program name> (<names of arguments>)

After writing the program name, write the names of the arguments inside of brackets. Use commas to separate the names of the arguments. (You cannot specify more than ten arguments for a single subprogram.) For example, the main program will have the statement:

SUB EXAMPLE (A, B, C)

－ 2-22 －