(11C) Compound Calculations

[Gamo]

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

[Dieter]

(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

[Gamo]

Thank You Dieter

Updated the instruction and program.

Gamo