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Programming

Named programs with variables

Write a program with a text name and a variable, store a value and run it.

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The RPN Advanced 42 lets you give programs readable names, and use named variables instead of just the stack. Letters are typed in ALPHA mode: you press a group key (like F-I) and then a letter inside it.

We build FX: it reads a variable X, squares it and subtracts 2. The MVAR line marks X as an input, which also lets the solver use the program.

RPN Advanced 42

Start on the main screen: Press EXIT (once or twice) to close any menu and return to the plain stack view of Y and X.

  1. Press shift, then R/S (PRGM) to start recording.

    ⇧PRGMR/S

  2. Add the label: PGM.FCN (shift, 3), pick LBL, then type the name FX. Each letter is two presses (its group, then the letter). Press ENTER to finish.

    ⇧PGM.FCN3Σ+⇧ALPHAENTER1/xΣ+XEQ1/xENTER

  3. Declare the input: PGM.FCN, press down twice for the second page, pick MVAR, and type X.

    ⇧PGM.FCN3▼▼Σ+XEQ1/xENTER

  4. Recall X and calculate: RCL, name X, then shift and the x² key, then 2 and minus.

    RCL⇧ALPHAENTERXEQ1/xENTER⇧x²√x2−

  5. End with RTN (PGM.FCN, second menu key), then leave program mode.

    ⇧PGM.FCN31/x⇧PRGMR/SEXITEXIT

  6. Store 3 in X, then run the program from the XEQ label menu with the first menu key.

    3STO⇧ALPHAENTERXEQ1/xENTERXEQΣ+

You should see3 squared minus 2 is 7.

RPN Advanced 42 key reference

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