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Best way to parseDouble with comma as decimal separator?
..." it will happily return 1.23 without indicating to you that the passed-in String contained non-parsable characters. In some situations that might actually be desirable, but I don't think it's usually the desired behavior.
– E-Riz
Jan 17 '13 at 19:37
...
How can we match a^n b^n with Java regex?
...'s start with a simpler problem: we want to match a+ at the beginning of a string, but only if it's followed immediately by b+. We can use ^ to anchor our match, and since we only want to match the a+ without the b+, we can use lookahead assertion (?=…).
Here is our pattern with a simple test harn...
How to get the instance id from within an ec2 instance?
... with the digits only. (Backslash + parentheses tell sed to remember a substring, which is recalled with \1.) I found this a little easier to read--the only backslashes are those required by sed: EC2_REGION="$(echo "$EC2_AVAIL_ZONE" | sed -e 's:\([0-9][0-9]*\)[a-z]*$:\1:')".
–...
Why is “a” != “a” in C?
...
What you are comparing are the two memory addresses for the different strings, which are stored in different locations. Doing so essentially looks like this:
if(0x00403064 == 0x002D316A) // Two memory locations
{
printf("Yes, equal");
}
Use the following code to compare two string values...
C++ new int[0] — will it allocate memory?
...
I guarantee you that new int[0] costs you extra space since I have tested it.
For example,
the memory usage of
int **arr = new int*[1000000000];
is significantly smaller than
int **arr = new int*[1000000000];
for(int i =0; i < 1000000000; i++) {
arr[i]...
项目管理实践教程二、源代码控制【Source Control Using VisualSVN Server ...
...服务器的配置也只是在图像界面上，指定认证方式、访问端口等简单操作；另外，用户权限的管理也是通过图像界面来配置。
2.为什么不用TFS?
回答:
因为我们一开始就是用Subversion和TortioseSVN,所以就没有更换其他的软件。至于T...
How to read a text file reversely with iterator in C#
...lt;/summary>
public sealed class ReverseLineReader : IEnumerable<string>
{
/// <summary>
/// Buffer size to use by default. Classes with internal access can specify
/// a different buffer size - this is useful for testing.
/// </summary>
...
What is move semantics?
...nderstand move semantics with example code. Let's start with a very simple string class which only holds a pointer to a heap-allocated block of memory:
#include <cstring>
#include <algorithm>
class string
{
char* data;
public:
string(const char* p)
{
size_t size =...
How can I remove a substring from a given String?
Is there an easy way to remove substring from a given String in Java?
12 Answers
12...
Declaring an unsigned int in Java
... original purpose of Java. But for example Smartphones do not dispose with extra memory. And they usually use Java, as far as I know. But well, I don't want to start a war between Java programers and the others.
– Tomáš Zato - Reinstate Monica
Jun 18 '13 at 8...