64 bit integer

Project requirements: encode a 64-bit integer into a network byte sequence. I know that pack (& #039; J & #039;, $ bigint) can be used in php5.6.3 and later versions ), but in this case, I have to disagree with the new php version. Now the company

From http://www.byvoid.com/blog/c-int64/ C/C ++ 64-bit integer In C/C ++, 64 is an undefined standard data type. In today's mainstream compilers, the support for 64-type integers is also different in different forms. Generally, 64-bit integer types

First, the ANSI c99 standard does not contain 64-bit integers. Secondly, many practical compilers support 64-bit integer types.For specific analysis, see: http://blog.csdn.net/lychee007/archive/2010/04/04/5449237.aspxThe key is the table:

In C/C ++, 64 is an undefined standard data type. In today's mainstream compilers, the support for 64-type integers is also different in different forms. Generally, 64-bit integer types are long and _ int64 (VC also supports _ int64), while printf ("

ACM is a 64-bit integer (_ int64) of C ++) When I was doing ACM, I often encountered some big integers. The commonly used built-in integer types are often too small: the range of long and Int Is [-2 ^ 31,2 ^ 31), that is,-2147483648 ~ 2147483647.

32-bit machines, and 64-bit machines, the situation is different. Only 32-bit machines are discussed below. int, unsigned int is 32-bit, sizeof (int) returns 4. The description is 4 bytes (that is, 32 bits). long int, long unsigned int is the same,

_ Int64 is a signed 64-bit integer data type, that is, long in C # And bigint in SQL Server. The value range is-2 ^ 63 (-9,223,372,036,854,775,808) to 2 ^ 63-1 (9,223,372,036,854,775,807), the storage space occupies 8 bytes. Used when the integer

When I was doing ACM, I often encountered some big integers. The commonly used built-in integer types are often too small: Long and intThe value range is [-2 ^ 31,2 ^ 31), that is,-2147483648 ~ 2147483647. The unsigned range is [0, 2 ^ 32), that is0

A byte has 8 bits, so the 32-bit int takes 32 bits/8 bits = 4 bytes, and the 64-bit int takes 64 bits/8 bits = 8 bytes. 32-bit, 64-bit unsigned integer maximum value: 2^64-1 = 18446744073709551615 2^32-1 = 4294967295 32-bit, 64-bit signed

Sometimes in-place operations are used. You need to quickly find the position (subscript) of the first 1 or 0 of an integer binary )? For example, if the binary value of decimal number 100 is 1100100, its first 1 is at the position (bsf, bit scan

If you use 64-bit integers and 32-bit integers, how long does it take to represent subtle levels of time? #define __stdc_format_macros #include #include #include #include #include using namespace std; int main (int argc, char** argv) {

The widely used distributed cache Redis and memcached support the addition and subtraction of integer value values, which corresponds to the incr and DECR commands in the specific command.INCR/DECR is an atomic operation (Memcached 1.2.4 and later

JsonJSON is a simple way to represent data, it is easy to understand, easy to parse, easy to remember. But on the other hand, JSON has some limitations because there are only a few types of data such as NULL, Boolean, number, string, array, and

Microsoft Visual C ++ does not support long and visuallong Microsoft Visual C ++ does not support long In C/C ++, 64 is an undefined standard data type. In today's mainstream compilers, the support for 64-type integers is also different in different

On a talk about MongoDB installation and management, which involves a number of concepts, data structure of other API calls, do not know it's okay, in fact very easy, this will introduce.1. DocumentationDocumentation is the core concept of MongoDB.

      SSE and SSE2 instruction system is very similar, SSE2 than SSE is only a small number of additional floating-point processing capabilities, 64-bit floating-point operation support and 64-bit integer operation support. Why is       SSE faster

MongoDB Documents use Bson (Binary JSON) to organize data, bson similar to Json,json is simply a way of representing data, containing only 6 data types (NULL, Boolean, number, string, array, and object). Does not fully meet the needs of complex

On a talk about MongoDB installation and management, which involves a number of concepts, data structure and some API calls, do not know it's okay, actually very simple, this will be a brief introduction.1. DocumentationThe document is the core

In the previous article, we talked about MongoDB installation and management, which involves some concepts, data structures, and some API calls. It doesn't matter if you don't know it. It's actually very simple. This article will briefly introduce

Today in the use of mongoexport export to meet certain conditions of the data, encountered an error, is now recorded, and for this error on the MongoDB digital type to do further study.Background and error information Today you receive a business