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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...
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...
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:')".
–...
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 =...
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]...
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...
In Python, how do I create a string of n characters in one line of code?
I need to generate a string with n characters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters:
...
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...