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13-4 Simple Programming
Program Boundaries (LBL and RTN)
If you want more than one program stored in program memory, then a program
needs a label to mark its beginning (such as ) and a return to mark its
end (such as ).
Notice that the line numbers acquire an to match their label.
Program Labels
Programs and segments of programs (called routines) should start with a label. To
record a label, press:
letter–key
The label is a single letter from A through Z. The letter keys are used as they are for
variables (as discussed in chapter 3). You cannot assign the same label more than
once (this causes the message ), but a label can use the same
letter that a variable uses.
It is possible to have one program (the top one) in memory without any label.
However, adjacent programs need a label between them to keep them distinct.
Programs can not have more than 999 lines.
Program Returns
Programs and subroutines should end with a return instruction. The keystrokes are:
When a program finishes running, the last RTN instruction returns the program
pointer to , the top of program memory.
Using RPN, ALG and Equations in Programs
You can calculate in programs the same ways you calculate on the keyboard: