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请输入英文单字，中文词皆可：

0    
0
adj 1: indicating the absence of any or all units under
consideration; "a zero score" [synonym: {zero}, {0}]
n 1: a mathematical element that when added to another number
yields the same number [synonym: {zero}, {0}, {nought},
{cipher}, {cypher}]

A dictionary containing a natural history requires too
many hands, as well as too much time, ever to be hoped
for. --Locke.
0 \0\ adj.
1. indicating the absence of any or all units under
consideration; -- representing the number zero as an
Arabic numeral.

Syn: zero
[WordNet 1.5 PJC]

{zero}

0 Numeric zero, as opposed to the letter ‘O’ (the 15th
letter of the English alphabet). In their unmodified forms they look a lot
alike, and various kluges invented to make them visually distinct have
compounded the confusion. If your zero is center-dotted and letter-O is
not, or if letter-O looks almost rectangular but zero looks more like an
American football stood on end (or the reverse), you're probably looking at
a modern character display (though the dotted zero seems to have originated
as an option on IBM 3270 controllers). If your zero is slashed but
letter-O is not, you're probably looking at an old-style ASCII graphic set
descended from the default typewheel on the venerable ASR-33 Teletype
(Scandinavians, for whom Ø is a letter, curse this arrangement).
(Interestingly, the slashed zero long predates computers; Florian Cajori's
monumental A History of Mathematical Notations notes
that it was used in the twelfth and thirteenth centuries.) If letter-O has
a slash across it and the zero does not, your display is tuned for a very
old convention used at IBM and a few other early mainframe makers
(Scandinavians curse this arrangement even more,
because it means two of their letters collide). Some Burroughs/Unisys
equipment displays a zero with a reversed slash. Old
CDC computers rendered letter O as an unbroken oval and 0 as an oval broken
at upper right and lower left. And yet another convention common on early
line printers left zero unornamented but added a tail or hook to the
letter-O so that it resembled an inverted Q or cursive capital letter-O
(this was endorsed by a draft ANSI standard for how to draw ASCII
characters, but the final standard changed the distinguisher to a tick-mark
in the upper-left corner). Are we sufficiently confused yet?


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  • What is the difference between 0. 0. 0. 0, 127. 0. 0. 1 and localhost?
    0 0 0 0 has a couple of different meanings, but in this context, when a server is told to listen on 0 0 0 0 that means "listen on every available network interface" The loopback adapter with IP address 127 0 0 1 from the perspective of the server process looks just like any other network adapter on the machine, so a server told to listen on 0
  • factorial - Why does 0! = 1? - Mathematics Stack Exchange
    $\begingroup$ The theorem that $\binom{n}{k} = \frac{n!}{k!(n-k)!}$ already assumes $0!$ is defined to be $1$ Otherwise this would be restricted to $0 <k < n$ A reason that we do define $0!$ to be $1$ is so that we can cover those edge cases with the same formula, instead of having to treat them separately
  • What is IPV6 for localhost and 0. 0. 0. 0? - Stack Overflow
    The 0 0 0 0 and :: addresses are reserved to mean "any address" So, for example a program that is providing a web service may bind to 0 0 0 0 port 80 to accept HTTP connections via any of the host's IPv4 addresses These addresses are not valid as a source or destination address for an IP packet
  • What is the difference between NULL, \0 and 0? - Stack Overflow
    NULL is not guaranteed to be 0 -- its exact value is architecture-dependent Most major architectures define it to (void*)0 '\0' will always equal 0, because that is how byte 0 is encoded in a character literal I don't remember whether C compilers are required to use ASCII -- if not, '0' might not always equal 48
  • What is %0|%0 and how does it work? - Stack Overflow
    @Pavel: What a bat file does is: read instruction, at the end of file terminate If you run %0: Process 1: starts, run %0 (thus create process 2); then die Process 2: starts, run %0 (thus create process 3); then die [ ] you alway have at most 2 process running because the creator will die
  • c - What do 0LL or 0x0UL mean? - Stack Overflow
    LL designates a literal as a long long and UL designates one as unsigned long and 0x0 is hexadecimal for 0 So 0LL and 0x0UL are an equivalent number but different datatypes; the former is a long long and the latter is an unsigned long There are many of these specifiers: 1F float 1L long 1ull unsigned long long 1 0 double
  • Regex that accepts only numbers (0-9) and NO characters
    CAUTION: In JavaScript, \d is equivalent to [0-9], but in NET, \d by default matches any Unicode decimal digit, including exotic fare like ႒ (Myanmar 2) and ߉ (N'Ko 9) Unless your app is prepared to deal with these characters, stick with [0-9] (or supply the RegexOptions ECMAScript flag)
  • What does javascript:void (0) mean? - Stack Overflow
    void(0) is needed in many cases; "#" is a hack that brings with it a whole host of problems (it would not work in the app I'm writing, that brought me to this page) – felwithe Commented Mar 24, 2015 at 3:46





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