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 This explanation makes sense also for a protozoon like me.
It does not solve my Problem, but it answers my question
modified 19-Jan-21 21:04pm.
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That's why people keep hiring me to do things with the English language, rather than C#.
I wanna be a eunuchs developer! Pass me a bread knife!
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So you consider element 47 not as the first one.
The ninth element is #55, the eigth is #54... the 1st is #48, the 0th is #47. Fair enough, from a programmer point of view. Your grandmother might disaggree. But as we all know: Today, computer guys rule the world.
In sports games, we still rank the competitors as "1st place", "2nd place" and "3rd place". As soon as computer guys succeed in taking over sports, it most surelu will be changed to "0th place", "1st place" and "2nd place"...
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Member 7989122 wrote: So you consider element 47 not as the first one.
I think you must have misread. Element a(47) is the first element.
Treat the "a(47)" as an identifier (which is precisely what it is) and not as something to do with its cardinality.
It's like you can have variables named 'a', 'b', and 'c', but those names/identifiers have nothing to do with the order they're used in, their importance, etc.
"An array element by any other name would still be in the same cardinal position" -- Wm. Shakespeare, who predicted the existence of arrays centuries before computers were built.
I wanna be a eunuchs developer! Pass me a bread knife!
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I agree.
Let's say you're instructed to "get on the highway headed east and drive to the second exit". You don't count the interchange you enter at. Nor do you consider where "exit 2" might be -- you may have entered at exit 2, or it may be to your west.
So "every tenth" has nothing to with how the elements may be indexed, only with which order they're encountered in.
For that matter, does it matter if an array cell is empty? Would those count?
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PIEBALDconsult wrote: For that matter, does it matter if an array cell is empty? Would those count?
Sure. If a hotel clerk has to check the tenth pigeonhole from the left for mail, he doesn't skip the empty ones.
I wanna be a eunuchs developer! Pass me a bread knife!
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True, so it depends on the task.
A customs clerk who is checking every tenth boat in the harbor will skip empty slips.
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I don't think this is a question about English but about "Computerese".
A well known joke is that "Computer amateurs think 256 is a round number. Real computer guys consider 255 a round number - they count from zero."
Before computer guys took over the world, arrays could have any base. In Pascal, an array could run from index 1814 to 2050. Ordinary people could relate to it, e.g. as years. That reduced the importance of the Computer Guys, so they detested it. Even the Fortran style, where the first element of array a was a[1], was too obvious to Common Man, reducing the power of the Computer Guy. Luckily, base zero index won the war. (There is only a small problem left: What if there is no "zero" element, like in the calender? What happened in year 1 belongs in eventsOfYear[1], but what about eventsOfYear[0]? That year never existed! Year -1 was immediately followed by year 1! ... Fortunately, the Unix epoch doesn't apply to historic dates!)
Yet, there is a question of where "every 10th" is counted from: Is the "first" (or zeroth, if you like) every tenth element the one with the lowest index, the one with the tenth lowest index, or the one ten above the lowest index? If we had had a quantum computer, it could have provided all three results, with varying degrees of probability/validity.
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Even early FORTRAN compilers used the trick of using address of A(n) as being (address of fictitious A(0)) + (n * width of data type of A); or as the literature of the day put it (address of A(1)) + (n - 1) * (width of data type A)
[historical note: versions of FORTRAN prior to 1977 only had uppercase variable name and all versions used '(' and ')', not '[' and ']'; but that doesn't affect the validity of what I am saying]
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The first computer I played around with at the instruction level had an instruction "MIX3" to decrement the accumulator by one and then multipy by 3. This was a 16-bit mini (PDP-11 class) with a 48 bit floating point format, 3 words (memory was not byte adressable). The instruction was tailor made for Fortran, to calculate the offset from the start of a 1-based float array of element "n" - just like you describe, but with a fixed element width of 3 words.
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#1 is the way I would interpret the question. (English speaker) 
"Go forth into the source" - Neal Morse
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I know that you're a long time member Nelek, and I certainly don't have as high a reputation as you, so I can't help wondering:
At what rep point value should I start posting my programming questions in the Lounge instead of QA as well? 
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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Never argue with a fool. Onlookers may not be able to tell the difference.
Mark Twain
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Johnny J. wrote: At what rep point value should I start posting my programming questions in the Lounge instead of QA as well
When you're above OG.
On the other hand, I see this more as a philosophical question about counting vs indexing (it's amazing how many people are mixing those up) rather than programming.
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Johnny J. wrote: I know that you're a long time member Nelek and, I certainly don't have as high a reputation as you
1)You longer than me
2a) There is only a difference of 25k between you and me, so no that much to deserve this kind of ironic comment
2b) If you want it, you can have all my reputation added to yours. It is not going to bring food to my table or give me a rise at work, so all yours.
Johnny J. wrote: so I can't help wondering:
At what rep point value should I start posting my programming questions in the Lounge instead of QA as well?
And I can't help but wondering:
if you see that as a programming question, do you need glasses?
The question was (simplified for you):
Does the english sentence "every 10th" imply that you have to start in the first one?
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
modified 13-Mar-20 11:49am.
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Let's put it this way: Imagine the state you live in chose to simplify taxes, and told all people to line up. Then, with everyone in place, they say: "This year, we will require one tenth of your total income as taxes. To simplify the procedure, every tenth person should give us all their income, and everyone else can go."
Now, if you ask the people, I'm sure almost all will agree that the 10th must pay, not the first. After all, that is exactly what the politicians said.
But, if you ask the authorities, they'll say differently, because then they're in danger of ending up short in cash: If there are 99 lined up, and only 9 would pay, there wouldn't be enough taxes collected; in an extreme case, there are only nine people lined up, and no taxes collected. Therefore, the authorites will demand that for every group of 10 people or less, the first should pay.
Of course the authorities' stance - as so often - doesn't correspond to what the politicians said...
So, to answer your question:
The correct answer is #1, but the politicians stating the task actually meant #2.
GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)
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I hope no politicians are reading this and getting stupid ideas.
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Just make sure you are third to eighth and you'll be happy.
- I would love to change the world, but they won’t give me the source code.
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Stefan_Lang wrote: If there are 99 lined up,
They will change the law and say every 5th has to pay. This way they get 19 people's earnings
And try to sell it as it was for our good
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Conventional usages aren't logical, they are conventional. On Thursday, to most people 'next Saturday' means 'Saturday of next week', 9 days away, not 'the next Saturday' which would be 'day after tomorrow'.
The conventional usage here is that 'every tenth' means 'the first and every tenth following'. Being stated using an assumed shared convention rather than a precise definition is one continuing devilment of software requirements.
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Member 14772340 wrote: o most people 'next Saturday' means 'Saturday of next week', 9 days away, not 'the next Saturday' which would be 'day after tomorrow'.
Not for me.. if I want to have the 9 days gap I say "Saturday of next week" because "next saturday" is the first one that comes from now on, that is the day after tomorrow.
Member 14772340 wrote: The conventional usage here is that 'every tenth' means 'the first and every tenth following'.
And this "language" or "people" aspect was exactly what I wanted to know.
Most of the answers here were against the "conventional usage" though.
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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im just gonna write these out to see the differences
What you doing Saturday
What you doing this Saturday
What you doing next Saturday
What you doing the Saturday after nexts
What you doing Saturday next week
What you doing next weekend
How was last weekend
How was the weekend
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Supposing we are on Thursday:
maze3 wrote: What you doing Saturday #1a
What you doing this Saturday #1a
What you doing next Saturday #1b
What you doing the Saturday after nexts #2
What you doing Saturday next week #2
What you doing next weekend #1
How was last weekend #3
How was the weekend #3
Grouped by same meaning for me.
1a and 1b possiblity to be different if and only if they are asked in the same context one after another.
Even in that case, I would go for "What are you doing this/next Saturday? And the following?"
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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At what time of the day, on which day, does "next Saturday" skip one week ahead? If I ask you on one Saturday, "What will you be doing next Saturday?", is it 7 or 14 days ahead? If I ask you on Sunday night when I leave your mountain cabin, is "next Saturday" 6 or 13 days ahead?
On Thursday, as you assume, most people will not be in doubt. Maybe not even on Wednesday. Tuesday? Not quite as certain. Monday even less. Sunday: Maybe things have flipped then (or rather: not yet flipped one week ahead).
"Saturday after next" is quite obvious, but "Saturday next week" depends on the culture on a Sunday. In my childhood, Sunday was the last day of the week, making "Saturday next week" 6 days ahead. At some point (maybe 30-35 years ago) it was changed so that Sunday is the first day of the week. Saturday this week is 6 days later, Saturday next week is 13 days later. The calender setup in Windows allows defining Sunday as the last day of the week, indicating that some cultures still stick to the conventions of my childhood.
Bottom line: Anyone claiming that there is a clear cut, unambiguous answer to this, is narrowminded and ignorant of other cultures.
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Member 7989122 wrote: "What will you be doing next Saturday?", is it 7 or 14 days ahead? If I ask you on Sunday night when I leave your mountain cabin, is "next Saturday" 6 or 13 days ahead?
In your example, for me 7 or 6. Even saying Saturday next week (being today saturday or sunday) would still be 7 or 6 days.
Member 7989122 wrote: In my childhood, Sunday was the last day of the week, making "Saturday next week" 6 days ahead.
Still the same for me.
Member 7989122 wrote: At some point (maybe 30-35 years ago) it was changed so that Sunday is the first day of the week. Saturday this week is 6 days later,
Then yes you are right.
Anyways... in the moment I think there can be missunderstandings I just ask for confirmation with a date.
- Can you pick me up next saturday night?
- the 8th or the 15th?
This way... it doesn't matter. 
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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When broken down, this is a good intro to programming questions.
Nelek wrote: in an array
This indicates that an array is being used.
Most arrays are zero based.
Quote: Display every 10th number
To get your mind around this concept might be similar to that the length of an array can be 10, but the last position in the array is 9.
And as others pointed out. a[0] should not be expected in the output. Unless modulo was part of the previous discussions, and the person that wrote the question assumed and mixed up "a%10 == 0" being a possible solution, should be corrected.
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