what 2 bits

While some information is stored, it does not need to occupy a full byte, only a few or one bits. For example, when storing a switching volume, there are only 0 and 12 states, with one binary. In order to save storage space and make processing

Reprinted from: http://www.cnblogs.com/911/archive/2008/05/20/1203477.htmlA bitwise operation is a binary-based operation. In system software, it is often necessary to deal with bits problems. The C language provides 6 bit operationsOperator. These

bit arithmeticThe operation component of a bitwise operation can only be integer or character data, and the bitwise operation considers the operand as a bit string information composed of binary bits, and completes the specified operation by bit,

STL provides a weighted permutation algorithm, which is more convenient after the violence example.At the end of the article there are manual, sorted by dictionary order of the nth permutation, the method of findingNext_permutation (A,A+4); Detect

For the WWDG routines given by the STM32 window watchdog and the atomic battleship, there are a few issues to be recorded. 1. WWDG time-out formula derivation 1.1 WWDG work diagram 1.2 WWDG time-out formula derivation (1) The value of the upper

First, about UTF-8UTF-8Unicode transformation format-8bit. is a multi-byte encoding used to solve international characters. It uses 8 bits (that is, one byte) for English, and Chinese uses 24 bits (three bytes) to encode. UTF-8Contains

When you create a table, you specify the data type for each column of the table, Oracle has 5 main data types, character types, numeric types, datetime types, LOB types, and pseudo-columns.One, character type1. Char typeFixed length string, length

A. mysql table structure:The data type of the Member_price column is float (20,2) (Note: Maximum 20-bit floating-point number, 2-bit precision )Insert Record:INSERT into ' member_price ' (' id ', ' data_type ', ' month ', ' member_count ', '

Oracle Number type query, sometimes you encounter the problem of loss of precision, the following shows you a resolution of the Oracle Number type query precision loss method for your reference.One, the Oracle number type query needs to find the

due to contact with the lower level of data processing to the following use of finishing (reference network)bit arithmeticThe Operation component of a bitwise operation can only be integer or character data, and the bitwise operation considers the

zhanhailiang 日期：2014-12-19Algorithm Description:Base64 requires that every three bytes of 8Bit be converted to four 6Bit bytes (38 = 46 = 24), and then add 6Bit two bit higher 0 to make up four 8Bit bytes, that is, the converted string will

JS in the decimal point after the two-bit method is the most commonly used is the rounding function, before I introduced the JS rounding a common function, here just use, below we take a float type decimal point after two some methods summary http://

Below we will introduce how JavaScript preserves two decimal places:RoundedThe following processing results are rounded:var num =2.446242342// output result is 2.45Not roundedThe following processing results are not rounded:First, put the

For some decimal point after a number of floating-point numbers, we may only need to retain 2 bits, but JS does not provide such a direct function, so we have to write the function to implement this function, the code is as follows: Copy Code

The main contents of this study note:Describes the various data types supported by MySQL (commonly used) and explains its main features.MySQL supports a variety of data types, mainly including numeric types, date and time types, and string

http://blog.csdn.net/heanyu/article/details/6202500 RTP (Real time Transport Protocol) RTP is a transport protocol for multimedia traffic on the Internet that is published by the IETF (Internet Engineering Task Force) as RFC1889 . RTP is defined

VARCHAR2 (size) A variable-length string whose maximum length is size bytes; The maximum value of size is 4000 and the minimum value is 1; You must specify a size of VARCHAR2;NVARCHAR2 (size) A variable-length string whose maximum length is a size

--varchar,varchar2Contact:1.varchar/varchar2 for storing variable-length stringssuch as varchar (20), which is stored in the string ' ABC ', the field in the database is only 3 bytes, not 20 bytesthe maximum value for 2.size is 4000, and the minimum

My mood: Today suddenly rain and sunny, a weekend and so to pass, always feel time is fast, whether it is work hours or after work time, total feeling time is not enough. Recently the blog is also less, some knowledge with simple words to describe

iOS format specificationDirectory Overview Date format OverviewDate formatDeclaration Time format: NSDateFormatter *date_formatter = [[NSDateFormatter alloc] init];Set value time format: [Date_formatter setdateformat:@ "yyyy mm