0x0D,0x0A,0x1A分别指的是什么？

yerssa 2010-05-06 09:54:31

0x0D,0x0A,0x1A分别指的是什么？

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crifan 2012-08-13

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【详解】回车换行 0x0D 0x0A CR LF \r \n的来龙去脉
http://www.crifan.com/detailed_carriage_return_0x0d_0x0a_cr_lf__r__n_the_context/

技术僧 2010-05-08

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回车，换行，提交

sixbusy 2010-05-08

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你是要发短信吧！
0x0d 0x0a 是回车换行
0x1A 就是 ctrl+z

但通常是
0x1A 0x0d 0x0a
短信 + 0x1a 是必须的 0x0d 0x0a 表示 AT 指令结束！

chaoliu1024 2010-05-07

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16进制，自己打印下就知道了啊

weilong8998 2010-05-07

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１６进制呀

赵4老师 2010-05-07

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《计算机组成原理》
和C语言数字常量语法：
C++ Integer Constants
Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.

Syntax

integer-constant :

decimal-constant integer-suffixopt
octal-constant integer-suffixopt
hexadecimal-constant integer-suffixopt
'c-char-sequence'

decimal-constant :

nonzero-digit
decimal-constant digit

octal-constant :

0
octal-constant octal-digit

hexadecimal-constant :

0x hexadecimal-digit
0X hexadecimal-digit
hexadecimal-constant hexadecimal-digit

nonzero-digit : one of

1 2 3 4 5 6 7 8 9

octal-digit : one of

0 1 2 3 4 5 6 7

hexadecimal-digit : one of

0 1 2 3 4 5 6 7 8 9
a b c d e f
A B C D E F

integer-suffix :

unsigned-suffix long-suffixopt
long-suffix unsigned-suffixopt

unsigned-suffix : one of

u U

long-suffix : one of

l L

64-bit integer-suffix :

i64

To specify integer constants using octal or hexadecimal notation, use a prefix that denotes the base. To specify an integer constant of a given integral type, use a suffix that denotes the type.

To specify a decimal constant, begin the specification with a nonzero digit. For example:

int i = 157; // Decimal constant
int j = 0198; // Not a decimal number; erroneous octal constant
int k = 0365; // Leading zero specifies octal constant, not decimal

To specify an octal constant, begin the specification with 0, followed by a sequence of digits in the range 0 through 7. The digits 8 and 9 are errors in specifying an octal constant. For example:

int i = 0377; // Octal constant
int j = 0397; // Error: 9 is not an octal digit

To specify a hexadecimal constant, begin the specification with 0x or 0X (the case of the “x” does not matter), followed by a sequence of digits in the range 0 through 9 and a (or A) through f (or F). Hexadecimal digits a (or A) through f (or F) represent values in the range 10 through 15. For example:

int i = 0x3fff; // Hexadecimal constant
int j = 0X3FFF; // Equal to i

To specify an unsigned type, use either the u or U suffix. To specify a long type, use either the l or L suffix. For example:

unsigned uVal = 328u; // Unsigned value
long lVal = 0x7FFFFFL; // Long value specified
// as hex constant
unsigned long ulVal = 0776745ul; // Unsigned long value