HP 20S recurring key identification  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: HP 20S recurring key identification (/thread175042.html) 
HP 20S recurring key identification  Andrew  11222010 Just wondering how to enter a recurring number without hitting the last digit several times. Thanks.
Re: HP 20S recurring key identification  Karl Schneider  11222010 Quote: ??? Did you mean the HP20S, and not the HP20b, correct? Also, by "recurring number", did you mean a constant value used for repeated calculations, or a repeatingsequence fractional part of a number? I don't see a constantoperand key or capability on the HP20S or in its manual.  KS
Edited: 22 Nov 2010, 9:51 p.m.
Re: HP 20S recurring key identification  Nigel J Dowrick  11222010 I've never come across a recurring decimal facility on any calculator, except for a couple of new Casio models (e.g., FX83 GT Plus). I'm sure that no HP model has this facility. Does anyone know differently?
Re: HP 20S recurring key identification  Tommy  11222010 If it is a repeating fractional part of a number, you may enter it as a fraction. Suppose x=0.2977777... 10x = 2.977777... 9x = 2.68 x=2.68/9 This is "a recurring number without hitting the last digit several times" /Tommy
Re: HP 20S recurring key identification  Katie Wasserman  11222010 I have a Bohn Omnitrex 8 desktop calculator. Its extremely simple logic using DTL chips doens't implement any sort of decimal point. The way it does division is to simply show a "running quotient", meaning that it only stores the remainder and the divisor and just keeps going. Because of this it allows infinitely long quotients and therefore, in some sense, recurring decimals. For example if you divide 1 by 7 and keep hitting the "=" key you'll see: 142857142857........ If you give it something with a larger period like 1 divided by 181 you'll see: 005524861878........ and it will keep going for 180 digits then repeat. It's pretty neat, very primitive and the only calculator that I've ever come across that does this. Katie
Edited: 22 Nov 2010, 1:53 p.m.
Re: HP 20S recurring key identification  Walter B  11222010 That's really nice logic  never heard of any calculator like this before. Thanks for pointing to that.
