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- Thread starter Apple_Robert
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Personally I’d return that calculator to wherever you bought it from.
Interesting result.
What happens if you insert an explicit multiplication symbol before the (.
I mention this because the Wikipedia item I linked and quoted specifically mentions "implicit" multiplication, which is what you have with 2(2+2).
I'd also like to say that I'm pleasantly stunned that a calculator with that many features is $15 on Amazon. I'm pretty sure I paid at least 10x that for my HP-41CX at the time.
And returning fire would not be productive.Shots fired!!
Manually inserting gets 16.
Shots fired!!
not trying to be mean but the calculator isn’t correct.
[doublepost=1564880269][/doublepost]
I saw the implicit comment you wrote earlier but I am surprised that a modern calculator (or any calculator these rules were written prior to electronic calculators) wouldn’t pick up on that.
Parser WarsShots fired!!
Episode 4: A Hopeful Newt
All the replies that rely on mechanized ways of getting an answer have the same problem. From Google, to Wolfram Alpha, to the Casio calculator, every one of them has a parser that determines its behavior. The parser is written according to rules that humans provided, so if the rules don't cover a particular case, then the parser won't handle that case. So the main thing the differing results show is what rules were used for the different parsers.
Let the shelling continue. I'll be sitting here in my... Comfy Chair.
So we can deduce the calculator's parser embodies the "implied multiplication" rule.
Now I might have to search its user manual (or other reference material) to see if it states that anywhere, or what its full set of parsing rules might be.
An Asian friend who has a doctorate in mathematics (and a doctorate in speech pathology, go figure) said something interesting:
By Chinese education he would say it’s 1 because the implicit multiplication of 2 attaches to the parens so that calc would be done immediately after the parens, then followed by left to right. 8 / 2(2+2)
I still say it’s 16.
The rules are officially used by most of the world. I am not sure about China are what’s inside the parentheses are done first. I’d like to know what other countries official rules are but it’s probably hard to get a real answer when half the population forgot the rules once they passed their final exams.
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I think it should depend on the units, i.e. what's being measured.
If it's ounces of beer, I vote for 16.
If it's speeding tickets, I vote for 1.
Thanks for that.
Pages E-65 & E-66 list the operator precedence (Priority). I think there's a documentation error there, within Priority 8. Or another way to put it is implied multiplication should be Priority 8, and the first line of what's currently at Priority 8 should be Priority 9, and all subsequent items moved down.
Where do I file a bug report?
good find, but I don’t think most non-graphic calculators can be upgraded. Good to know. I’ve never owned a calculator that I could put a whole formula in. Even when I took calculus I wasn’t allowed anything more than a basic scientific calculator.
Kids these days.
When I took calculus, we had to use slide rules.
And we had to make them ourselves, using leg bones from animals we'd killed with our bare hands. We were, however, allowed to use flint scrapers to incise the numeric markings, but we had to make those ourselves, too.
All kidding aside, I didn’t like not being allowed tools that were available but in reality it forces us to actually learn how to solve the equations.
All kidding aside, I agree with you.
All kidding aside, I really did have to learn to use a slide rule, but it was for high school chemistry (and electronics, how could I forget), not calculus. Being the nerd I
so true.
facts are no longer facts for some parties.
or, as Conway The Mathematician, pointed out: they have Alternative Facts.
Not to try to out nerd you, but I have two abacuses. Is abacus also plural for abacus? Is abaci singular?
The division symbol is not typically used in this situation.
We don’t know intent so the post is neither right nor wrong
They are equal in PEMDAS. it is actually
P
E
MD
AS
that’s the rule. Division is multiplying by the reciprocal.
The rules of operation address any ambiguity. In the equation presented after parens, it’s solution is simply working left to right.
