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python numpy machine epsilon
...):
print(np.finfo(float).eps)
# 2.22044604925e-16
print(np.finfo(np.float32).eps)
# 1.19209e-07
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What does “atomic” mean in programming?
...riable is written using two separate operations: one that writes the first 32 bits, and a second one which writes the last 32 bits. That means that another thread might read the value of foo, and see the intermediate state.
Making the operation atomic consists in using synchronization mechanisms i...
What is the difference between NULL, '\0' and 0?
...used and means the value of the pointer is 0, independent of whether it is 32bit or 64bit (one case 4 bytes the other 8 bytes of zeroes).
string context - the character representing the digit zero has a hex value of 0x30, whereas the NUL character has hex value of 0x00 (used for terminating strings)...
What is a “callback” in C and how are they implemented?
...tring.h>
#include "../../common_typedef.h"
typedef void (*call_back) (S32, S32);
void test_call_back(S32 a, S32 b)
{
printf("In call back function, a:%d \t b:%d \n", a, b);
}
void call_callback_func(call_back back)
{
S32 a = 5;
S32 b = 7;
back(a, b);
}
S32 main(S32 argc, S8 *...
What does “#pragma comment” mean?
...|
edited Jun 21 '14 at 17:32
answered Aug 14 '10 at 18:14
K...
Is it possible to use global variables in Rust?
...ation is performed at runtime. Here are a few examples:
static SOME_INT: i32 = 5;
static SOME_STR: &'static str = "A static string";
static SOME_STRUCT: MyStruct = MyStruct {
number: 10,
string: "Some string",
};
static mut db: Option<sqlite::Connection> = None;
fn main() {
p...
How to update Python?
...nswers are for the same bit-versions, and by bit-version I mean 64-bit vs. 32-bit. For example, these answers would apply to updating from 64-bit Python-2.7.10 to 64-bit Python-2.7.11, ie: the same bit-version. While it is possible to install two different bit versions of Python together, it would r...
libcurl 32位动态dll库、静态lib库下载 - 源码下载 - 清泛网 - 专注C/C++及内核技术
libcurl 32位动态dll库、静态lib库下载libcurl 动态库 静态库源码编译好的libcurl库，包括动态库dll版本，和静态库lib版本。libcurl官方源码下载地址：https: curl haxx se download html采用cmake生成sln解决方案，vs编译。源码编译好的libcurl库，...
尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 ...
本帖最后由 zqp2013 于 2015-4-23 09:59 编辑
尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 位 Oracle 客户端组件的情况下以 64 位模式运行，将出现此问题。
为什么会提示AppInventor2.exe 不是有效的 Win32 - App Inventor 2 离线版 ...
...ntor2后运行，提示C:\AppInventor2\AppInventor2.exe 不是有效的 Win32 应用程序 这是为什么？
https://aka.ms/vs/16/release/vc_redist.x64.exe
装一个运行环境试试，如果还是运行不了，那就是不支持 win7。
还是建议使用 win10 及以上系统，win7 ...