ASCII 音标拼音: ['æski]
美国信息交换标准代码 ; (
AMERICAN STANDARD CODE FOR
INFORMATI -
ON INTERCHANGE 的缩写)
美国资讯交换标准代码 (
AMERICAN STANDARD CODE FOR INFORMATI -
ON INTERCHANGE 的缩写)
ASCII n 1 : (
computer science )
a code for information exchange between computers made by different companies ;
a string of 7 binary digits represents each character ;
used in most microcomputers [
synonym : {
American Standard Code for Information Interchange }, {
ASCII }]
ASCII \
ASCII \
n . [
Acronym :
American Standard Code for Information Interchange .](
Computers )
1 .
the American Standard Code for Information Interchange ,
a code consisting of a set of 128 7 -
bit combinations used in digital computers internally ,
for display purposes ,
and for exchanging data between computers .
It is very widely used ,
but because of the limited number of characters encoded must be supplemented or replaced by other codes for encoding special symbols or words in languages other than English .
Also used attributively ; --
as ,
an ASCII file .
Syn :
American Standard Code for Information Interchange .
[
PJC ]
Ascii \
As "
ci *
i \,
Ascians \
As "
cians \,
n .
pl . [
L .
ascii ,
pl .
of ascius ,
Gr . ?
without shadow ; '
a priv . ?
shadow .]
Persons who ,
at certain times of the year ,
have no shadow at noon ; --
applied to the inhabitants of the torrid zone ,
who have ,
twice a year ,
a vertical sun .
[
1913 Webster ]
{
American Standard Code for Information Interchange }
American Standard Code of Information Interchange ASCII : /
as ´
kee /,
n . [
originally an acronym (
American Standard Code for Information Interchange )
but now merely conventional ]
The predominant character set encoding of present -
day computers .
The standard version uses 7 bits for each character ,
whereas most earlier codes (
including early drafts of ASCII prior to June 1961 )
used fewer .
This change allowed the inclusion of lowercase letters —
a major win —
but it did not provide for accented letters or any other letterforms not used in English (
such as the German sharp -
S ß.
or the ae -
ligature æ
which is a letter in ,
for example ,
Norwegian ).
It could be worse ,
though .
It could be much worse .
See EBCDIC to understand how .
A history of ASCII and its ancestors is at http ://
www .
wps .
com /
texts /
codes /
index .
html .
Computers are much pickier and less flexible about spelling than humans ;
thus ,
hackers need to be very precise when talking about characters ,
and have developed a considerable amount of verbal shorthand for them .
Every character has one or more names —
some formal ,
some concise ,
some silly .
Common jargon names for ASCII characters are collected here .
See also individual entries for bang ,
excl ,
open ,
ques ,
semi ,
shriek ,
splat ,
twiddle ,
and Yu -
Shiang Whole Fish .
This list derives from revision 2 .
3 of the Usenet ASCII pronunciation guide .
Single characters are listed in ASCII order ;
character pairs are sorted in by first member .
For each character ,
common names are given in rough order of popularity ,
followed by names that are reported but rarely seen ;
official ANSI /
CCITT names are surrounded by brokets : <>.
Square brackets mark the particularly silly names introduced by INTERCAL .
The abbreviations “
l /
r ”
and “
o /
c ”
stand for left /
right and “
open /
close ”
respectively .
Ordinary parentheticals provide some usage information .
The pronunciation of #
as ‘
pound ’
is common in the U .
S .
but a bad idea ;
Commonwealth Hackish has its own ,
rather more apposite use of ‘
pound sign ’ (
confusingly ,
on British keyboards the £
happens to replace #;
thus Britishers sometimes call #
on a U .
S .-
ASCII keyboard ‘
pound ’,
compounding the American error ).
The U .
S .
usage derives from an old -
fashioned commercial practice of using a #
suffix to tag pound weights on bills of lading .
The character is usually pronounced ‘
hash ’
outside the U .
S .
There are more culture wars over the correct pronunciation of this character than any other ,
which has led to the ha ha only serious suggestion that it be pronounced “
shibboleth ” (
see Judges 12 :
6 in an Old Testament or Tanakh ).
The ‘
uparrow ’
name for circumflex and ‘
leftarrow ’
name for underline are historical relics from archaic ASCII (
the 1963 version ),
which had these graphics in those character positions rather than the modern punctuation characters .
The ‘
swung dash ’
or ‘
approximation ’
sign (∼)
is not quite the same as tilde ~
in typeset material ,
but the ASCII tilde serves for both (
compare angle brackets ).
Some other common usages cause odd overlaps .
The #, $, >,
and &
characters ,
for example ,
are all pronounced “
hex ”
in different communities because various assemblers use them as a prefix tag for hexadecimal constants (
in particular ,
#
in many assembler -
programming cultures ,
$
in the 6502 world , >
at Texas Instruments ,
and &
on the BBC Micro ,
Sinclair ,
and some Z80 machines ).
See also splat .
The inability of ASCII text to correctly represent any of the world '
s other major languages makes the designers '
choice of 7 bits look more and more like a serious misfeature as the use of international networks continues to increase (
see software rot ).
Hardware and software from the U .
S .
still tends to embody the assumption that ASCII is the universal character set and that characters have 7 bits ;
this is a major irritant to people who want to use a character set suited to their own languages .
Perversely ,
though ,
efforts to solve this problem by proliferating ‘
national ’
character sets produce an evolutionary pressure to use a smaller subset common to all those in use .
安装中文字典英文字典查询工具!
中文字典英文字典工具:
复制到剪贴板
英文字典中文字典相关资料:
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