大约有 40,000 项符合查询结果（耗时：0.0655秒） [XML]
Removing double quotes from variables in batch file creates problems with CMD environment
Can anybody help with effective and safe way of removing quotes from batch variables?
11 Answers
...
Speed up the loop operation in R
I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the...
How can I transform string to UTF-8 in C#?
I have a string that I receive from a third party app and I would like to display it correctly in any language using C# on my Windows Surface.
...
Is it expensive to use try-catch blocks even if an exception is never thrown?
We know that it is expensive to catch exceptions. But, is it also expensive to use a try-catch block in Java even if an exception is never thrown?
...
Understanding typedefs for function pointers in C
I have always been a bit stumped when I read other peoples' code which had typedefs for pointers to functions with arguments. I recall that it took me a while to get around to such a definition while trying to understand a numerical algorithm written in C a while ago. So, could you share your tips a...
How to achieve function overloading in C?
Is there any way to achieve function overloading in C? I am looking at simple functions to be overloaded like
14 Answers
...
C/C++ 如何向上取整？ - C/C++ - 清泛网 - 专注C/C++及内核技术
C/C++ 如何向上取整？一般地，向上取整有两种方法：#include <math.h>int _tmain(int argc, _TCHAR* argv[]){int a = 6, b = 5; ceil函数printf("%d...一般地，向上取整有两种方法：
#include <math.h>
int _tmain(int argc, _TCHAR* argv[])
{
int a = 6, b = 5;
//ce...
[完整实例源码]C&C++修改文件只读属性 - C/C++ - 清泛网 - 专注C/C++及内核技术
[完整实例源码]C&C++修改文件只读属性先使用GetFileAttributes获取文件属性，判断该文件是否是只读，然后SetFileAttributes修改文件属性。代码如下：#include "stdafx.h"int _...先使用GetFileAttributes获取文件属性，判断该文件是否是只读，然...
c/c++ volatile和mutable关键字 - C/C++ - 清泛网 - 专注C/C++及内核技术
c/c++ volatile和mutable关键字1 volatile关键字：一个定义为volatile的变量是说这变量可能会被意想不到地改变，这样，编译器就不会去假设这个变量的值了。例如：假设编译 1、volatile关键字：
一个定义为volatile的变量是说这变量可...