64-bit Advantage: 64-bit applications can directly access 4EB of memory and file size up to 4 EB (2 of the 63 power), access to large databases. This article describes the 64-bit C language Development program considerations.
1 32-bit and 64-bit C data types
32 and 64-bit C language built-in data types, as shown in the following table.
The uppercase and numeric meanings of the first row in the previous tab
The server installed by the company is a 64-bit 2003 system that runs in the form of a 32-bit IIS6.With Windows Server 2003TM Service Pack 1,iis 6.0, you can run 32-bit WEB applications using the windows-32-on-windows-64 (WOW64) compatibility layer on 64-bit Windows. IIS 6.0 uses WOW64 to run 32 personal product applic
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1) What is the difference between a 64-bit system and a 32-bit system?
1. 64-bit CPU has greater addressing capability and supports up to 16 GB memory, while 32-bit only supports 4 GB memory
2. 64-bit CPU can extract 64-bit data at a time, which is twice higher than 32-bit. Theoretically, the performance wi
64-bit Visual Basic for Applications OverviewMicrosoft Visual Basic for Applications (VBA) is the Visual basic version that is included with Microsoft Office. In Microsoft Office 2010, VBA includes language features that enable VBA code to run correctly in both 32-bit and 64-bit environments.Note By default, the 32-bit version of Office 2010 is installed. During the installation process, you must explicitly
One[ROOT@LINUXZGF ~] #getconf long_bit[ROOT@LINUXZGF ~] #getconf word_bit(the int and long types in a 32-bit system are generally 4 bytes, and the int type in the 64-bit system is still 4 bytes, but LONG has become a 8-byte inux "getconf word_bit" and "getconf long_bit" are available in the system Gets the number of digits for word and long. 64-bit systems should be 32 and 64, respectively. )Two[ROOT@LINUXZ
The history of computer development is from the previous 8-bit, 16-bit to the first 32-bit and 64-bit, the number of digits is one of the important criteria used to measure the performance of a computer, and the number of digits determines the maximum capacity of the computer, the maximum length of the file, the transmission speed of the data inside the computer, the processing speed and the precision.
The 32
To determine whether UNIX systems and library files are 32-bit or 64-bit detailed
First, view system 32 or 64-bit system
Bootinfo-y View the number of hardware bitsBootinfo-k View kernel digits
Second, view the library file is 32-bit or 64-bit
1. Use the file command
Linux:
# file libnss1_files-2.2.4.so
libnss1_files-2.2.4.so:elf
What are 64-bit and 32-bit Internet ExplorerIf you experience problems when you use the 64-bit version of Internet Explorer, try using the 32-bit version of Internet Explorer to view the same Web site. If the problem occurs in these two versions of Internet Explorer, you must determine whether the problem is caused by a Web object, an object, or if the issue is caused by Internet Explorer.For more informati
Apple released IPhone5S moment, 64 app bit went to the front. At the time I saw Apple's official data released by Ios7.x's SDK to support 64-bit applications. The built-in application is already 64-bit.I remember I had a 16-bit system when I was in touch with the computer, and the pointer was 16-bit addressable. When using TURBOC, also according to the size of the application of the choice is tiny mode or other. Later, for a very long time, 32-bit mod
quotient we require.The principle is as follows: VALUE/10 ~= [[(Value * 0xCCCCCCCD)/2^32]/2^3], square brackets represent rounding.The first thing we need to know is that the result of the 32-bit unsigned integer (uint32_t) on Intel x86 is actually a 64-bit integer, namely uint64_t, the result of multiplying is stored in EAX and edx two registers, EAX, edx is 32
Click to open linkIn 32-bit, 64-bit systems, the only change is the length of the pointer; The 32-bit system is 4 bytes, 64 bits is 8 bytes. This refers to the bit width of the register, which is the so-called three-position . Results under 32-bit platform:Results under 64-bit platform:One, the following points are worthy of our attention:1, about the value ra
Win7 system has many versions, Home Edition, Advanced Edition, flagship edition, and today we are talking about the Win7 flagship system 64-bit and 32-bit difference;
Regardless of the Win7 system, WIN8 system, Server 2003, and even XP systems have 32 and 64-digit points.
Since the Win7 system is now the mainstream of the computer operating system, today we focus on the Win7 system
You can use the command "getconf long_bit" To view if the returned result is 32, the description is 32 bits, and the result returned is 64, the description is 64 bits. You can also use the command "uname-a" To view, the output of the results, if there is x86_64 is 64-bit, not 32-bit.A few ways to see how many bits Linux is: Check whether the Linux machine is a
In the forum to see a lot of netizens questioned that 32-bit system can not install 64-bit WINDOWS7 system, here recommend a very simple way to install 64-bit system under 32-bit system.
32-bit systems can be arbitrary, such as the 32-bit xp,vista,windows7.
The 64-bit system can also be arbitrary.
The installation m
First, view the system 32 or 64-bit system bootinfo-y View the number of hardware bitsBootinfo-k View kernel digits
Second, view the library file is 32-bit or 64-bit
1. Use the file command
Linux:
# file Libnss1_files-2.2.4.soLibnss1_files-2.2.4.so:elf 32-bit LSB Shared object, Intel 80386, version 1, not stripped
# file Libtrsbean.soLibtrsbean.so:ELF 64-bit LSB
The recent study of Python's regular expressions requires batch generation of random data. This involves to the module SYS, time in the Maxint, CTime, the code in the run CTime format times has been the error can not run.
After studying the relevant data, it is found that the Maxint value is different in the operating system, the MAXINT>2^32 is under the 64-bit operating system, and the number of seconds in the 32
The origin of the problem
Cross-compilation is very important (should be said to be necessary) for embedded development, but the recent use of cross-compilation tools on physical Linux machines has often encountered a problem: the cross-compile tool version is correct, the installation steps are correct, and the environment variable is set correctly, but it is running ARM-LINU-GCC- V has been reported bash:/OPT/ARM-2009Q3/BIN/ARM-LINUX-GCC: No error in the file or directory, is very depressing,
prescribes the boundaries of those segments, ensuring that one process does not interfere with the reading and writing of the segments of another process.
All segments in the system are within the linear address space of the processor, but only logical addresses can determine the position of one byte in a particular segment. So when the actual program accesses the memory, there is a mechanism to map the logical address to the linear address. A logical address consists of a segment selector and
Many of my friends may not know what is the difference between a 32-bit Windows 7 system and a 64-bit system. I will introduce it to you in detail.
The 64-bit Windows 7 system is selected because the memory size is larger than or equal to 4 GB. In 32-bit Windows 7, the memory usage may be 3.xxg. The addressable memory space is the most significant characteristic of 32
Because of the dynamic library called in the project, these dynamic libraries are placed under C:\WINDOWS\SYSTEM32, but when deployed to a 64-bit machine may be problematic, recently this problem has been tangled for a long time, in the native 32 for the system test dynamic call DDL successfully, deployed to 64-bit window Server2008 above also no problem, but why to the 64-bit WIN7 system has a problem?Finally found that the original DLL location is n
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