HP 41 - branching to local label and return stack - FINAL RESULTS AND PROGRAMS
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05-20-2019, 03:41 PM
Post: #3
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RE: HP 41 - branching to local label and return stack
The typical way I've seen it done (such as in the TVM program on the Advantage module) is to have the appropriate A-E local labels for input/output variables, and another local label (usually J) that displays the soft-menu. To enter values in the variables, just type a value into X and press the corresponding key.
The rough structure of the program would be like this: LBL "TVM" ...various program-specific setup steps (clear key assignments, turn on USER, etc.)... XEQ J //Display the soft-menu and stop RTN LBL A FC?C 22 //Check for user input XEQ "N" //No user input, call the solve/computation routine for this variable STO 01 //Store X into 01 (n, in the case of TVM), whether user input or the newly computed value RTN ...similar labels for B-E, and a-e if you want shifted functions... LBL J "N I% PV PMT FV" AVIEW RTN This is a pretty user-friendly way to do it that doesn't require a lot of extra program steps, and the UX is very similar to the TVM and soft-menu solvers on other models. |
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