芬兰荣登孤独星球2017年全球最佳旅游目的地榜单

百度 会议议程1.审议种子法修订草案；2.审议全国人大内务司法委员会关于提请审议慈善法草案的议案；3.审议全国人大环境与资源保护委员会关于提请审议深海海底区域资源勘探开发法草案的议案；4.审议国务院关于提请审议电影产业促进法草案的议案；5.审议国务院关于提请审议关于授权国务院开展药品上市许可持有人制度试点和药品注册分类改革试点工作决定草案的议案；6.审议国务院关于提请审议批准亚洲基础设施投资银行协定的议案；7.审议最高人民法院关于行政审批工作情况的报告；8.审议最高人民检察院关于刑罚执行监督工作情况的报告；9.审议最高法、最高检关于刑事案件速裁程序试点情况的中期报告；10.审议全国人大常委会执法检查组关于检查消费者权益保护法实施情况的报告；11.审议全国人大常委会执法检查组关于检查农业法实施情况的报告；12.审议全国人大内务司法委员会关于第十二届全国人大第三次会议主席团交付审议的代表提出的议案审议结果的报告；13.审议全国人大财政经济委员会关于第十二届全国人大第三次会议主席团交付审议的代表提出的议案审议结果的报告；

In computer science, the sign bit is a bit in a signed number representation that indicates the sign of a number. Although only signed numeric data types have a sign bit, it is invariably located in the most significant bit position, so the term may be used interchangeably with "most significant bit" in some contexts.

Almost always, if the sign bit is 0, the number is non-negative (positive or zero). If the sign bit is 1 then the number is negative. Formats other than two's complement integers allow a signed zero: distinct "positive zero" and "negative zero" representations, the latter of which does not correspond to the mathematical concept of a negative number.

When using a complement representation, to convert a signed number to a wider format the additional bits must be filled with copies of the sign bit in order to preserve its numerical value, a process called sign extension or sign propagation.

Sign bit weight in Two's complement

Bits	Value using Two's complement
0000	0
0001	1
0111	7
1000	?8
1001	?7
1111	?1

Two's complement is by far the most common format for signed integers. In Two's complement, the sign bit has the weight -2^w-1 where w is equal to the bits position in the number. With an 8-bit integer, the sign bit would have the value of -2^8-1, or -128. Due to this value being larger than all the other bits combined, having this bit set would ultimately make the number negative, thus changing the sign.

Sign bit weight in Ones' complement

Bits	Value using One's complement
0000	0
0001	1
0111	7
1000	?7
1001	?6
1111	?0

Ones' complement is similar to Two's Complement, but the sign bit has the weight -(2^w-1 +1) where w is equal to the bits position in the number. With an 8-bit integer, the sign bit would have a value of -(2^8-1 +1), or -127. This allows for two types of zero: positive and negative, which is not possible with Two's complement.

Sign bit in sign magnitude integers

Bits	Value using sign magnitude
0000	0
0001	1
0111	7
1000	?0
1001	?1
1111	?7

Using sign magnitude, the sign bit directly determines the sign. If the sign bit is 0, the number is positive; if the sign bit is 1, the number is negative. Similarly with Ones' Complement, this allows for both a positive and a negative zero.

Sign bit in floating-point numbers

Floating-point numbers, such as IEEE format, IBM format, VAX format, and even the format used by the Zuse Z1 and Z3 use a Sign and magnitude representation.