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This program calculate compound solutions.
Provide any three out of four variables for the result of the remaining variable for
[n] [i] [PV] [FV]

LBL A for [n] period
LBL B for [i] interest
LBL C to Reset
LBL D for [PV] Present Value
LBL E for [FV] Future Value

Remark:
Each input data indicate as 0.00 on display with FIX 2
This program didn't use sign convention where money paid out is negative.

Example: switch to USER mode f USER
10 > A > 0.00 (Store [n])
10 > B > 0.00 (Store [i])
1000 > C > 0.00 (Store [PV])

remaining variable is [FV]
E > 2593.74 is the answer for [FV]

If [i] change to 7 what is the [FV]

7 > B > 0.00 (Store new [i])
E > 1967.15 (answer for new [FV] when [i] is 7%)

To start a new problem: LBL C to Reset

Program:
Code:
``` LBL A    // [n] STO 1 0 X≠Y RTN RCL 5 RCL 4 / LN RCL 2 1 + LN / STO 1 RTN LBL B    // [i] EEX 2 / STO 2 0 X≠Y RTN RCL 5 RCL 4 / RCL 1 1/x Y^X 1 - STO 2 EEX 2 x RTN LBL D    // [PV] STO 4 0 X≠Y RTN RCL 5 RCL 2 1 + RCL 1 Y^X / STO 4 RTN LBL E    // [FV] STO 5 0 X≠Y RTN RCL 4 RCL 2 1 + RCL 1 Y^X x STO 5 RTN LBL C    // Reset CLx STO 1 STO 2 STO 4 STO 5 FIX 2 RTN```

Gamo
(04-10-2018 12:21 PM)Gamo Wrote: [ -> ]Provide any three out of four variables for the result of the remaining variable ...

That's a nice program and, as far as I can tell, it seems to work correctly.

But you should remove this line from the example:

(04-10-2018 12:21 PM)Gamo Wrote: [ -> ]Answer of [FV] 2593.74 on display > input to [FV] > E > 0.00

Unlike the previous pricing program, this one does store a calculated result in the respective register. So you do not have to re-enter it if you want to continue with this value.

In this example a new input isn't required even if the result had not been stored. You just have calculated FV, and now you change the interest rate to calculate a new FV. So the old one is overwritten anyway. You do not need the old FV to calculate a new one. ;-)

(04-10-2018 12:21 PM)Gamo Wrote: [ -> ]Program:
Code:
```... LBL C    // Reset REG CLx RTN```

The code looks very good. However, if possible, I would avoid clearing all registers. This way the user loses all data he may have stored. So it's always a good idea to clear only the required registers. At least on a calculator with constant memory.

Code:
```... LBL C    // Reset CLx STO 1 STO 2 STO 4 STO 5 FIX 2 RTN```

Dieter
Thank You Dieter

Updated the instruction and program.

Gamo
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