Due to my job, I have to travel a lot - and therefore, currency exchange is an issue. And it is not just USD to EUR. I am “living” in Euro (meaning my salary is in Euros), but I need to pay (and analyze businesses results) in:
- Swiss Francs
- US Dollars
- British Pound
- Norwegian Kroner
- Swedish Kroner
And the solution given by the HP17bII+ is the best of the built-in solutions in my knowledge - but there are ways to improve upon that - see our examples for the HP Prime in past blog issues.
Now, my other calculator of choice nowadays is the HP 41CL. Its enormous memory capacity and the access to all modules allow to do many things, and make it a practical choice for everyday calculations. So I set to create a program practical enough for everyday use - for MY use, i.e.
I will use the 5 upper function keys and its shifted functions too. The main function is the conversion of the foreign currency TO Euro, and the shifted function is FROM Euro to the foreign currency. I use the registers 24 to 29 to store the exchange rates against the Euro, as foreign units per Euro (when you have all the registers you want, you don’t care anymore for SIZE - that’s the good thing about the 41CL)
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1 LBL “EXCHN”
2 “NK $ CH & SK”
3 AVIEW
4 RTN
5 LBL A
6 RCL 24
7 /
8 RTN
9 LBL a
10 RCL 24
11 *
12 RTN
13 LBL B
14 RCL 25
15 /
16 RTN
17 LBL b
18 RCL 25
19 *
20 RTN
21 LBL C
22 RCL 26
23 /
24 RTN
25 LBL c
26 RCL 26
27 *
28 RTN
29 LBL D
30 RCL 27
31 /
32 RTN
33 LBL d
34 RCL 27
35 *
36 RTN
37 LBL E
38 RCL 28
39 /
40 RTN
41 LBL e
42 RCL 28
43 *
44 RTN
45 END