All Questions
10,852
questions
403
votes
19
answers
281k
views
How to round up the result of integer division?
I'm thinking in particular of how to display pagination controls, when using a language such as C# or Java.
If I have x items which I want to display in chunks of y per page, how many pages will be ...
- 58.1k
317
votes
29
answers
237k
views
How much faster is C++ than C#?
Or is it now the other way around?
From what I've heard there are some areas in which C# proves to be faster than C++, but I've never had the guts to test it by myself.
Thought any of you could ...
- 12.2k
300
votes
5
answers
121k
views
What do 'statically linked' and 'dynamically linked' mean?
I often hear the terms 'statically linked' and 'dynamically linked', often in reference to code written in C, C++ or C#. What are they, what exactly are they talking about, and what are they linking?
- 89.5k
224
votes
22
answers
63k
views
Why does C# not provide the C++ style 'friend' keyword? [closed]
The C++ friend keyword allows a class A to designate class B as its friend. This allows Class B to access the private/protected members of class A.
I've never read anything as to why this was left ...
- 61.6k
208
votes
11
answers
87k
views
How to get started with developing Internet Explorer extensions?
Does anyone here have experience with/in developing IE extensions that can share their knowledge? This would include code samples, or links to good ones, or documentation on the process, or anything.
...
- 65.2k
203
votes
13
answers
61k
views
What are the differences between Generics in C# and Java... and Templates in C++? [closed]
I mostly use Java and generics are relatively new. I keep reading that Java made the wrong decision or that .NET has better implementations etc. etc.
So, what are the main differences between C++, C#,...
- 18k
194
votes
19
answers
237k
views
Naming convention - underscore in C++ and C# variables
It's common to see a _var variable name in a class field. What does the underscore mean? Is there a reference for all these special naming conventions?
- 37.7k
188
votes
52
answers
68k
views
Why is it considered a bad practice to omit curly braces? [closed]
Why does everyone tell me writing code like this is a bad practice?
if (foo)
Bar();
//or
for(int i = 0 i < count; i++)
Bar(i);
My biggest argument for omitting the curly braces is that ...
182
votes
15
answers
425k
views
What does void mean in C, C++, and C#?
Looking to get the fundamentals on where the term "void" comes from, and why it is called void. The intention of the question is to assist someone who has no C experience, and is suddenly looking at a ...
- 5,090
179
votes
9
answers
254k
views
Kill some processes by .exe file name
How can I kill some active processes by searching for their .exe filenames in C# .NET or C++?
- 1,931
178
votes
12
answers
197k
views
How can I specify a [DllImport] path at runtime?
In fact, I got a C++ (working) DLL that I want to import into my C# project to call it's functions.
It does work when I specify the full path to the DLL, like this :
string str = "C:\\Users\\...
- 3,045
169
votes
11
answers
19k
views
Why does the default parameterless constructor go away when you create one with parameters
In C#, C++ and Java, when you create a constructor taking parameters, the default parameterless one goes away. I have always just accepted this fact, but now I've started wondering why.
What is the ...
- 2,135
163
votes
12
answers
18k
views
Never seen before C++ for loop
I was converting a C++ algorithm to C#.
I came across this for loop:
for (u = b.size(), v = b.back(); u--; v = p[v])
b[u] = v;
It gives no error in C++, but it does in C# (cannot convert int to ...
- 2,070
155
votes
20
answers
518k
views
Unable to load DLL (Module could not be found HRESULT: 0x8007007E)
I have a dll library with unmanaged C++ API code I need to use in my .NET 4.0 application. But every method I try to load my dll I get an error:
Unable to load DLL 'MyOwn.dll': The specified module ...
- 1,895
135
votes
13
answers
179k
views
Cannot find Dumpbin.exe
I do not see dumpbin.exe on my system. I have Visual Studio 2005 on my system. When I type dumpbin on the command line, it says unrecognizable command.
Does it come with Visual Studio by default, or ...
Rakesh Agarwal
123
votes
13
answers
9k
views
How to drive C#, C++ or Java compiler to compute 1+2+3+...+1000 at compile time?
In a recent interview, I was asked a really strange question. The interviewer asked me how can I compute 1+2+3+...+1000 just using compiler features. This means that I am not allowed to write a ...
- 8,385
119
votes
31
answers
444k
views
C++ performance vs. Java/C#
My understanding is that C/C++ produces native code to run on a particular machine architecture. Conversely, languages like Java and C# run on top of a virtual machine which abstracts away the native ...
117
votes
31
answers
148k
views
'do...while' vs. 'while'
Possible Duplicates:
While vs. Do While
When should I use do-while instead of while loops?
I've been programming for a while now (2 years work + 4.5 years degree + 1 year pre-college), and I've ...
- 1,460
116
votes
16
answers
90k
views
Does C++11 have C#-style properties?
In C#, there is a nice syntax sugar for fields with getter and setter. Moreover, I like the auto-implemented properties which allow me to write
public Foo foo { get; private set; }
In C++ I have to ...
- 5,808
112
votes
19
answers
29k
views
What is the fastest way to compute sin and cos together?
I would like to compute both the sine and co-sine of a value together (for example to create a rotation matrix). Of course I could compute them separately one after another like a = cos(x); b = sin(x);...
- 22.6k
111
votes
18
answers
218k
views
What's the best way to do a backwards loop in C/C#/C++? [closed]
I need to move backwards through an array, so I have code like this:
for (int i = myArray.Length - 1; i >= 0; i--)
{
// Do something
myArray[i] = 42;
}
Is there a better way of doing this?
...
- 74.8k
107
votes
14
answers
29k
views
Why should casting be avoided? [closed]
I generally avoid casting types as much as possible since I am under the impression that it's poor coding practice and may incur a performance penalty.
But if someone asked me to explain why exactly ...
- 3,893
104
votes
11
answers
62k
views
Equivalent of #region for C++
What's the C++ equivalent of #region for C++ so I can put in custom code collapsible bits and make my code a little easier to read?
- 10.1k
101
votes
4
answers
218k
views
C# equivalent of C++ vector, with contiguous memory?
What's the C# equivalent of C++ vector?
I am searching for this feature:
To have a dynamic array of contiguously stored memory that has no performance penalty for access vs. standard arrays.
I was ...
- 24.9k
99
votes
7
answers
127k
views
Possible to call C++ code from C#?
Is it possible to call C++ code, possibly compiled as a code library file (.dll), from within a .NET language such as C#?
Specifically, C++ code such as the RakNet networking library.
yiingchau
97
votes
16
answers
63k
views
What does the unary plus operator do?
What does the unary plus operator do? There are several definitions that I have found (here and here) but I still have no idea what it would be used for. It seems like it doesn't do anything but there ...
- 20.7k
97
votes
11
answers
5k
views
Efficiency of premature return in a function
This is a situation I encounter frequently as an inexperienced programmer and am wondering about particularly for an ambitious, speed-intensive project of mine I'm trying to optimize. For the major C-...
- 1,451
90
votes
11
answers
62k
views
Can I get Memcached running on a Windows (x64) 64bit environment?
Does anyone know IF, WHEN or HOW I can get Memcached running on a Windows 64bit environment?
I'm setting up a new hosting solution and would much prefer to run a 64bit OS, and since it's an ASP.Net ...
- 8,685
86
votes
5
answers
24k
views
What does stream mean? What are its characteristics?
C++ and C# both use the word stream to name many classes.
C++: iostream, istream, ostream, stringstream, ostream_iterator, istream_iterator...
C#: Stream, FileStream,MemoryStream, BufferedStream...
...
- 2,984
86
votes
7
answers
70k
views
C++ union in C#
I'm translating a library written in C++ to C#, and the keyword 'union' exists once. In a struct.
What's the correct way of translating it into C#? And what does it do? It looks something like this;
...
- 1,591
85
votes
12
answers
33k
views
Is C# really slower than say C++?
I've been wondering about this issue for a while now.
Of course there are things in C# that aren't optimized for speed, so using those objects or language tweaks (like LinQ) may cause the code to ...
- 48.5k
84
votes
6
answers
121k
views
using a class defined in a c++ dll in c# code
I have a dll that was written in c++, I need to use this dll in my c# code. After searching I found that using P/Invoke would give me access to the function I need, but these functions are defined ...
- 3,918
83
votes
5
answers
82k
views
pinvokestackimbalance -- how can I fix this or turn it off?
I just switched to vs2010 from vs2008. Exact same solution, except now every single call to a C++ dll yields a 'pinvokestackimbalance' exception.
This exception does not get fired in 2008. I have ...
- 14.8k
80
votes
10
answers
250k
views
Visual Studio /**/ comment shortcut?
I want to know how to put the /**/ comments through shortcut. I know the Ctrl+K+C shortcut for the // comments but it comments the whole line. Sometimes while debugging, I want to do something like "...
- 835
80
votes
11
answers
153k
views
Foreach loop in C++ equivalent of C#
How would I convert this code to C++?
string[] strarr = {"ram","mohan","sita"};
foreach(string str in strarr) {
listbox.items.add(str);
}
- 8,881
79
votes
4
answers
239k
views
What is C# equivalent of <map> in C++? [duplicate]
I have defined a class myComplex. I need to map it to integers. In C++ I would have created a map as
map<myComplex,int> first;
How to do such thing in C#?
- 1,177
75
votes
23
answers
69k
views
How do you flag code so that you can come back later and work on it?
In C# I use the #warning and #error directives,
#warning This is dirty code...
#error Fix this before everything explodes!
This way, the compiler will let me know that I still have work to do. What ...
72
votes
6
answers
81k
views
What are the definitions for LPARAM and WPARAM?
I know I'm being lazy here and I should trawl the header files for myself, but what are the actual types for LPARAM and WPARAM parameters? Are they pointers, or four byte ints? I'm doing some C# ...
- 48.9k
71
votes
2
answers
23k
views
Why are Cdecl calls often mismatched in the "standard" P/Invoke Convention?
I am working on a rather large codebase in which C++ functionality is P/Invoked from C#.
There are many calls in our codebase such as...
C++:
extern "C" int __stdcall InvokedFunction(int);
With a ...
- 933
68
votes
18
answers
13k
views
How much null checking is enough?
What are some guidelines for when it is not necessary to check for a null?
A lot of the inherited code I've been working on as of late has null-checks ad nauseam. Null checks on trivial functions, ...
- 17.9k
67
votes
4
answers
87k
views
How do I call C++/CLI from C#?
I have a class implemented in C++ that's responsible for the arithmetic computation of the program, and an interface using WPF. I process the input with C# but then how can I use my C++ class?
I've ...
- 781
66
votes
2
answers
87k
views
Passing strings from C# to C++ DLL and back -- minimal example
I am trying to make the absolute simplest minimal example of how to pass strings to and from a C++ DLL in C#.
My C++ looks like this:
using std::string;
extern "C" {
string concat(string a, ...
- 2,909
65
votes
6
answers
97k
views
How to call a C# library from Native C++ (using C++\CLI and IJW)
Background: As part of a larger assignment I need to make a C# library accessible to unmanaged C++ and C code. In an attempt to answer this question myself I have been learning C++/CLI the past few ...
- 2,230
64
votes
6
answers
18k
views
Pre & post increment operator behavior in C, C++, Java, & C# [duplicate]
DISCLAIMER: This is not a real-world example. It is just a theoretical question of how these languages work.
What exactly are the differences between C/C++, C#, and Java when it comes to post &...
- 5,785
58
votes
5
answers
87k
views
Is dependency injection useful in C++
C# uses Dependency Injection (DI) a lot to have a lossless and testable platform. For this, I need an interface and maybe a DI or Inversion of Control (IoC) container for resolving my instances.
But ...
- 993
57
votes
2
answers
6k
views
Why is "using System;" not considered bad practice?
I have a C++ background and I do fully understand and agree with the answers to this question: Why is “using namespace std;” considered bad practice?
So I'm astonished that, having some experience ...
- 5,853
56
votes
6
answers
80k
views
Ease-in and ease-out animation formula
Say, if I'm doing the Ease-Out and then Ease-In animation of an object's movement from X1 coordinate to X2 coordinate over S steps at equal time intervals. Can some suggest the formula to calculate ...
- 17k
55
votes
5
answers
107k
views
Is there pointer in C# like C++? Is it safe?
I'm writing an application that work with a tree data structure. I've written it with C++, now i want to write it by C#. I use pointers for implementing the tree data structure. Is there a pointer in ...
- 22.6k
54
votes
31
answers
7k
views
Technical reasons behind formatting when incrementing by 1 in a 'for' loop?
All over the web, code samples have for loops which look like this:
for(int i = 0; i < 5; i++)
while I used the following format:
for(int i = 0; i != 5; ++i)
I do this because I believe it to ...
54
votes
8
answers
7k
views
Code with undefined behavior in C#
In C++ there are a lot of ways that you can write code that compiles, but yields undefined behavior (Wikipedia). Is there something similar in C#? Can we write code in C# that compiles, but has ...
- 37.2k