Range syntax

[newbarker]

I'm looking through the C++ standard and see statements like this:

yields: the smallest q in
[p,p+n) such that
X::eq(*q,c) is true, zero
otherwise.

I'm not from a scientific/math background but would like to read more
about what this "[p,p+n)" syntax is called and how it's defined so
does anyone have a link to a web page about this please?

Regards,

Pete

[Obnoxious User]

On Thu, 16 Oct 2008 08:33:29 -0700, newbarker wrote:

I'm looking through the C++ standard and see statements like this:

yields: the smallest q in
[p,p+n) such that
X::eq(*q,c) is true, zero
otherwise.

I'm not from a scientific/math background but would like to read more
about what this "[p,p+n)" syntax is called and how it's defined so does
anyone have a link to a web page about this please?

Regards,

Pete

http://en.wikipedia.org/wiki/Interval_(mathematics)

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OU
Remember 18th of June 2008, Democracy died that afternoon.
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[Juha Nieminen]

ne*******@gmail.com wrote:

I'm not from a scientific/math background but would like to read more
about what this "[p,p+n)" syntax is called and how it's defined so
does anyone have a link to a web page about this please?

The notation of ranges is rather simple: Square brackets are used when
the extreme values are included in the range, and parentheses when they
are excluded. They can also be mixed, as in your example.

"[p, p+n)" means a range of values between p and p+n, including p but
excluding p+n.

In theory you could also have (p, p+n] which would mean a range of
values between p and p+n, excluding p but including p+n. Of course this
is seldom used when talking about C++.

[Victor Bazarov]

ne*******@gmail.com wrote:

I'm looking through the C++ standard and see statements like this:

yields: the smallest q in
[p,p+n) such that
X::eq(*q,c) is true, zero
otherwise.

I'm not from a scientific/math background but would like to read more
about what this "[p,p+n)" syntax is called and how it's defined so
does anyone have a link to a web page about this please?

I don't have a link, but this is a standard Western math notation for a
range that begins at 'p' *inclusively* and ends on 'p+n' but excludes
that value.

V
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[newbarker]

Many thanks to all that responded!

[James Kanze]

On Oct 16, 5:33 pm, [e-mail] wrote:

I'm looking through the C++ standard and see statements like this:

yields: the smallest q in
[p,p+n) such that
X::eq(*q,c) is true, zero
otherwise.

I'm not from a scientific/math background but would like to
read more about what this "[p,p+n)" syntax is called and how
it's defined so does anyone have a link to a web page about
this please?

Victor and Juha have already given the details, but it's worth
mentionning that this is called a half open interval---an
interval which includes its end points is closed, one which
doesn't is open. Also, the notation varies: "[a,b)" (or
"[a...b)") is almost universal in the anglo-saxon world, but in
France, I've often seen "[a;b[" or "[a...b[", with the [] being
used backwards to indicate openness. (Note too the use of ';'
instead of ','. This is usual in much of the world, where the
decimal character is a comma, and not a point.)

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[Victor Bazarov]

James Kanze wrote:

On Oct 16, 5:33 pm, [e-mail] wrote:

>I'm looking through the C++ standard and see statements like this:

>yields: the smallest q in
[p,p+n) such that
X::eq(*q,c) is true, zero
otherwise.

>I'm not from a scientific/math background but would like to
read more about what this "[p,p+n)" syntax is called and how
it's defined so does anyone have a link to a web page about
this please?

Victor and Juha have already given the details, but it's worth
mentionning that this is called a half open interval---an
interval which includes its end points is closed, one which
doesn't is open. Also, the notation varies: "[a,b)" (or
"[a...b)") is almost universal in the anglo-saxon world, but in
France, I've often seen "[a;b[" or "[a...b[", with the [] being
used backwards to indicate openness. (Note too the use of ';'
instead of ','. This is usual in much of the world, where the
decimal character is a comma, and not a point.)

The use of the inverted bracket to indicate the open end of the interval
is common in former Soviet Union as well. At least I was taught that
way... And while the comma *is* the decimal separator, I don't recall
the use of the semicolon in the interval.

V
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