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Chapter 8 Programming
3. A subroutine can be used in multiple locations in the same main routine, or it can
be called up by any number of main routines.
D
C E I J
Prog ”E” Prog ”I” Prog ”J”
A
Prog ”D”
Prog ”C”
4. Calling up a subroutine causes it to be executed from the beginning. After execu-
tion of the subroutine is complete, execution returns to the main routine, continu-
ing from the statement following the Prog command.
5. A Goto~Lbl command inside of a subroutine is valid inside of that subroutine only.
It cannot be used to jump to a label outside of the subroutine.
6. If a subroutine with the file name specified by the Prog command does not exist,
an error (Go ERROR) occurs.
7. In the RUN Mode, inputting the Prog command and pressing w launches the
program specified by the command.
Return
Function: This command returns from a subroutine.
Syntax: Return _
Description:
Execution of the Return command inside a main routine causes execution of the
program to stop.
Example: Prog ”A” Prog ”B”
1 → A_ For A → B To 10_
Prog ”B”_ B + 1 → C_
C ^ Next_
Return
Executing the program in File A displays the result of the operation (11).
Stop
Function: This command terminates execution of a program.
Syntax: Stop _
Description:
1. This command terminates program execution.
2. Execution of this command inside of a loop terminates program execution with-
out an error being generated.
Level 1 Level 2 Level 3 Level 4
Main Routine Subroutines
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