(11C) (15C) Convert German Units of Area Measurement

[Michael Zinn]

(04-10-2018 06:09 PM)Dieter Wrote:  

(04-10-2018 01:48 PM)michaelzinn Wrote:  Interesting! I didn't know that a Fußballfeld is just an alias for hectare when used as an area of measurement. That makes it even more confusing.

Well, that's at least a common way of visualizing hectares. Here the term "entspricht einer Größe von fünf Fußballfeldern" simply is a translation of "5 Hektar". But also take a look at Wikipedia. So a hectare fits very well if you consider the whole area inside the 400 m track.

By the way – if I remember correctly you once said you like "vintage programming", and in another thread you asked for traditional solutions to overcome the limits of simple programmable calculators. So maybe you will also like this idea:

The 11C/15C has is only a limited number of labels. More important, it can only display numbers, there is no text output. Now... did [A] convert from Saarlands to Fußballfelds or was it the other way round? Here is a simple trick: since areas cannot be negative the sign may be used to flag a result. This way both conversions can be done with one single program:

Code:

LBL A
x<0?   (TEST 2)
1/x
3
6
EEX
4
x
x<0?   (TEST 2)
1/x
CHS
RTN

Rule: Saarlands are positive, Fußballfelds are negative.
Want it the other way round? Replace x<0? with x>0?.

Convert 2 Saarlands: 2 [A] => –720.000
Since the result is negative you know that these are 720.000 Fußballfelds.

Convert one Million Fußballfelds: –1.000.000 [A] => 2,7778
Since the result is positive you know that these are 2,8 Saarlands.

Pressing [A] multiple times switches between the two units:
2
[A] => –720.000
[A] => 2
[A] => –720.000
[A] => 2
...

So the area is 2 Saarlands or 720.000 Fußballfelds.

Dieter

Ah, you are using the sign as an additional input parameter. Great idea!