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C++ convert hex string to signed integer
... << std::hex << "fffefffe";
ss >> x;
the following example produces -65538 as its result:
#include <sstream>
#include <iostream>
int main() {
unsigned int x;
std::stringstream ss;
ss << std::hex << "fffefffe";
ss >> x;
// out...
how to prevent “directory already exists error” in a makefile when using mkdir
...
On UNIX Just use this:
mkdir -p $(OBJDIR)
The -p option to mkdir prevents the error message if the directory exists.
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MySql export schema without data
I'm using a MySql database with a Java program, now I want to give the program to somebody else.
13 Answers
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Grep characters before and after match?
...efore and 4 characters after
$> echo "some123_string_and_another" | grep -o -P '.{0,3}string.{0,4}'
23_string_and
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How to create nonexistent subdirectories recursively using Bash?
I am creating a quick backup script that will dump some databases into a nice/neat directory structure and I realized that I need to test to make sure that the directories exist before I create them. The code I have works, but it seems that there is a better way to do it. Any suggestions?
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How do I split a string so I can access item x?
Using SQL Server, how do I split a string so I can access item x?
44 Answers
44
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Why do I get a segmentation fault when writing to a “char *s” initialized with a string literal, but
...ence between these initializations?
char a[] = "string literal";
char *p = "string literal";
My program crashes if I try to assign a new value to p[i].
A: A string literal (the formal term
for a double-quoted string in C
source) can be used in two slightly
different ways:
A...
Does Java support default parameter values?
...found is how Java handles it (that is, with overloading instead of default parameters).
For constructors, See Effective Java: Programming Language Guide's Item 1 tip (Consider static factory methods instead of constructors) if the overloading is getting complicated. For other methods, renaming some...
How to generate a simple popup using jQuery
I am designing a web page. When we click the content of div named mail, how can I show a popup window containing a label email and text box?
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Why should I declare a virtual destructor for an abstract class in C++?
I know it is a good practice to declare virtual destructors for base classes in C++, but is it always important to declare virtual destructors even for abstract classes that function as interfaces? Please provide some reasons and examples why.
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