I use long longs occasionally. I know there are some limitations regarding
the standards such as not using long long constants but what's the big
deal? Why is long long not used so much?
Mike
24  1872 
Michael B Allen wrote: I use long longs occasionally. I know there are some limitations regarding
the standards such as not using long long constants but what's the big
deal? Why is long long not used so much?
Mike
I've played with long long but I don't remember using it in a
program. I'm sure that if programming problem arises that requires
integers larger than +-2 or +4 billion, I will use long long quite
naturally.
--
Joe Wright mailto:jo****** **@comcast.net
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---
"Michael B Allen" <mb*****@ioplex .com> wrote in message
news:pa******** *************** *********@iople x.com... I use long longs occasionally. I know there are some limitations regarding
the standards such as not using long long constants but what's the big
deal? Why is long long not used so much?
Some people are still using Microsoft compilers which reject long long.
Apparently, MS are using macros such as ULONG64 in some of their headers.
I've asked some of their fans about the rationale for this, and got total
silence as an answer. long long appears to have reached full citizenship in
the recent round of MS road shows.
I have a version of their compiler which does support long long, and yet is
to be obsoleted at the end of the year, along with those which don't. Are
you implying that none of the Microsoft compilers support long long
constants? It's true that MS compilers may not take long constants as long
long.
Would you care to bet on the likelihood of people who still claim that long
long isn't standard changing their mind 6 months from now when MS stops
"supporting " compilers which reject it?
"Michael B Allen" <mb*****@ioplex .com> wrote in message
Why is long long not used so much?
A number must ultimately represent something in the real world. You seldom
need a number above 4 billion, which is about the number of adults in the
world. An exception is memory size, which can exceed 4GB on large systems
and may soon be around that on desktop PCs, but in C we use size_t for
amounts of memory.
"Malcolm" <ma*****@55bank .freeserve.co.u k> wrote in message
news:ca******** **@news6.svr.po l.co.uk...
"Michael B Allen" <mb*****@ioplex .com> wrote in message
Why is long long not used so much?
A number must ultimately represent something in the real world. You seldom
need a number above 4 billion, which is about the number of adults in the
world. An exception is memory size, which can exceed 4GB on large systems
and may soon be around that on desktop PCs, but in C we use size_t for
amounts of memory.
This will change soon as we move to IPv6. Networking will be one
application where >32bit numbers are required.
Dan
"Dan P." <dp************ ***@ec.rr.com> writes: "Malcolm" <ma*****@55bank .freeserve.co.u k> wrote in message
news:ca******** **@news6.svr.po l.co.uk...
"Michael B Allen" <mb*****@ioplex .com> wrote in message
Why is long long not used so much?
A number must ultimately represent something in the real world. You seldom
need a number above 4 billion, which is about the number of adults in the
world. An exception is memory size, which can exceed 4GB on large systems
and may soon be around that on desktop PCs, but in C we use size_t for
amounts of memory.
This will change soon as we move to IPv6. Networking will be one
application where >32bit numbers are required.
An IPv6 address is 128 bits, but I don't think it's typically
represented as a single number. I don't know of any systems that
directly support 128-bit integers anyway. (Counterexample s would not
contradict my main point.)
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
Keith Thompson wrote: "Dan P." <dp************ ***@ec.rr.com> writes:
.... snip ...
This will change soon as we move to IPv6. Networking will be
one application where >32bit numbers are required.
An IPv6 address is 128 bits, but I don't think it's typically
represented as a single number. I don't know of any systems
that directly support 128-bit integers anyway. (Counterexample s
would not contradict my main point.)
That should last throught the first Galactic Empire and the fall
of Trantor :-)
--
Chuck F (cb********@yah oo.com) (cb********@wor ldnet.att.net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net> USE worldnet address!
On Sun, 13 Jun 2004 15:05:48 +0100, "Malcolm"
<ma*****@55bank .freeserve.co.u k> wrote in comp.lang.c:
"Michael B Allen" <mb*****@ioplex .com> wrote in message
Why is long long not used so much?
A number must ultimately represent something in the real world. You seldom
need a number above 4 billion, which is about the number of adults in the
world. An exception is memory size, which can exceed 4GB on large systems
and may soon be around that on desktop PCs, but in C we use size_t for
amounts of memory.
What an absurd line of reasoning. Are you actually this clueless, or
just trolling?
On a heavy trading day on the US stock exchanges, the number of shares
traded on the NASDAQ exchange can exceed the maximum value of a signed
32-bit long int.
I seem to recall, but can't be bothered to look up, that there have
been days when the sum of shares traded on the AMEX and NASDAQ
exchanges exceeded the maximum value of an unsigned 32-bit long.
Not to mention the fact that a large number of simple mathematical and
statistical algorithms, often most efficiently implemented with
integer math, require raising numbers to the second power. The range
of the second power of numbers that fit in a 32-bit integer type most
certainly will not fit in anything less than a 64-bit integer type.
--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html
comp.lang.c++ http://www.parashift.com/c++-faq-lite/
alt.comp.lang.l earn.c-c++ http://www.contrib.andrew.cmu.edu/~a...FAQ-acllc.html
In article <s0************ *************** *****@4ax.com>,
Jack Klein <ja*******@spam cop.net> wrote: Not to mention the fact that a large number of simple mathematical and
statistical algorithms, often most efficiently implemented with
integer math, require raising numbers to the second power. The range
of the second power of numbers that fit in a 32-bit integer type most
certainly will not fit in anything less than a 64-bit integer type.
I think in one of Donald Knuth's book there was a trick question: What
is the fastest algorithm to calculate n raised to the 19th power? The
answer was: Since the result must fit into n bits, the argument can be
at most (some tiny number), so the fastest method is a lookup-table...
"Jack Klein" <ja*******@spam cop.net> wrote in message On Sun, 13 Jun 2004 15:05:48 +0100, "Malcolm"
<ma*****@55bank .freeserve.co.u k> wrote in comp.lang.c:
What an absurd line of reasoning. Are you actually this clueless, > or
just trolling?
On a heavy trading day on the US stock exchanges,
So you've come up with another exception. No-one is claiming that never ever
will you need a number over 4 billion. Clearly, if you need to give an id
number to the entire population of the world, or you need to tag every US
cent in circulation, or you are doing some fancy statistical work that
generates large integers, then these are exceptions. However the exceptions
don't arise very often, which is why you will seldom see long long used in
real programs. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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