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Extracting bits with a single multiplication
...at a simple example of getting a single byte manipulated. Using unsigned 8 bit for simplicity. Imagine your number is xxaxxbxx and you want ab000000.
The solution consisted of two steps: a bit masking, followed by multiplication. The bit mask is a simple AND operation that turns uninteresting bits ...
How to find the JVM version from a program?
...lement of the runtime version
java.vm.name "OpenJDK 64-Bit Server VM" "Java HotSpot(TM) 64-Bit Server VM" "Java HotSpot(TM) 64-Bit Server VM" Java Virtual Machine implementation name
java.vm.vendor "Oracle Corporation" ...
“No such file or directory” error when executing a binary
....2]
I was missing the /lib/ld-linux.so.2 file, which is needed to run 32-bit apps. The Ubuntu package that has this file is libc6-i386.
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How do you iterate through every file/directory recursively in standard C++?
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If using the Win32 API you can use the FindFirstFile and FindNextFile functions.
http://msdn.microsoft.com/en-us/library/aa365200(VS.85).aspx
For recursive traversal of directories you must inspect each WIN32_FIND_DATA.dwFileAttributes ...
WAMP error: Forbidden You don't have permission to access /phpmyadmin/ on this server
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Change the file content of c:\wamp\alias\phpmyadmin.conf to the following.
Note: You should set the Allow Directive to allow from your local machine for security purposes. The directive Allow from all is insecure and should be limited to your local machine.
<Directory "c:/wamp/apps/phpmya...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...just don't look at me when they're not as fast :)
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Low Memory (32-bit int, 32-bit machine)(from here):
unsigned int
reverse(register unsigned int x)
{
x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
x = (((x & 0xcccccccc) >> 2) | ((x & 0x3...
How can mixed data types (int, float, char, etc) be stored in an array?
...e is tagged pointer, which involves storing more information in the "free" bits of a pointer.
Depending on architectures you can use the low or high bits, but the safest and most portable way is using the unused low bits by taking the advantage of aligned memory. For example in 32-bit and 64-bit sys...
Compiling problems: cannot find crt1.o
...is you likely only have the gcc for your current architecture and that's 64bit. You need the 32bit support files. For that, you need to install them
sudo apt install gcc-multilib
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64 bit OS下int占几个字节？ - C/C++ - 清泛网 - 专注C/C++及内核技术
64 bit OS下int占几个字节？int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的，不受编译器的影响。__int64才是8位的。另外，指针是受编译器 OS影响的，3...int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的...
Get DOS path instead of Windows path
In a DOS window, how can I get the full DOS name/short name of the directory I am in?
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