HP 35s Scientific Calculator Manuel d'utilisateur télécharger pdf (Page 212)

14-2 Programming Techniques

 If you plan to have only one program in the calculator memory, you can

separate the routine in various labels. If you plan to have more than one

program in the calculator memory, it is better to have routines part of the

main program label, starting at a specific line number.

 A subroutine can itself call other subroutines.

The flow diagrams in this chapter use this notation:

The example below show you to call a subroutine to change the sign of the number

you input. Subroutine E that is called from routine D by line   

changes sign of the number. Subroutine E ends with a RTN instruction that sends

program execution back to routine D (to store and display the result) at line D004.

See the flow diagrams below.

Nested Subroutines

A subroutine can call another subroutine, and that subroutine can call yet another

subroutine. This "nesting" of subroutines — the calling of a subroutine within

another subroutine — is limited to a stack of subroutines 20 levels deep (not

counting the topmost program level). The operation of nested subroutines is as

shown below:

    1 Program execution branches from this line to the

line number marked  1 ("from 1").

    1 Program execution branches from a line number

marked  1 ("to 1") to this line.

   Starts here.

  

    1 Calls subroutine E.

    2 Returns here.

  

 

  

 1

Starts subroutine.

  Change sign of the number

 

 2

Returns to routine D.

1 2 ... 207 208 209 210 211 212 213 214 215 216 217 ... 381 382

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HP 35s Scientific Calculator Manuel d'utilisateur Page 212