C is a general-purpose computer programming language used for operating systems, games and other high performance work.

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Read K&R before learning low latency C++?

I have never really done a large amount of C programming but am in the middle of teaching myself low latency C++. Would it do more harm than good to read the K&R C programming book? I am a bit ...
2
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2answers
421 views

About ANSI C++ 2003 standard

I would like to ask for your help. I searched a lot on Internet, but I found mismatched informations. My questions: I tried to buy the "ISO/IEC 14882:2003(E) Programming Languages - C++" standard ...
4
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2answers
360 views

Allow threads (in c) to print messages without interfering with user input

I'm a writing a small webserver for personal use in c (not c++). I want to allow user input in the console like "shutdown server" or "restart server". In order to allow this kind of input the server ...
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1answer
282 views

I'm trying to create a visual representation of something, but I don't know what words to use, so I'll try to describe it

My project team is making a site that will use reddit style voting to track users' opinions on various issues, and use the data to create a "heat map". I say heat map in quotes because I'm not sure ...
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4answers
874 views

main() function prototypes

As far as I know, main () function has the following prototypes: int main(); int main(int argc, char **argv); Now, C does not support overloading, then how are multiple prototypes of ...
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1answer
600 views

How much usage of “likely” and “unlikely” macros is too much?

The often known as likely and unlikely macros help the compiler know whether an if is usually going to be entered or skipped. Using it results in some (rather minor) performance improvements. I ...
42
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4answers
19k views

When do you use float and when do you use double

Frequently in my programming experience I need to make a decision whether I should use float or double for my real numbers. Sometimes I go for float, sometimes I go for double, but really this feels ...
64
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3answers
21k views

Why do programming languages, especially C, use curly braces and not square ones?

The definition of "C-Style language" can practically be simplified down to "uses curly braces ({})." Why do we use that particular character (and why not something more reasonable, like [], which ...
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1answer
183 views

Compile GPL-code into a JNI-capable shared library and use it in commercial software [closed]

I am developing an application for Android in JAVA which calls GPLed C-code via JNI. I have modified & capsulated a GPL-software under a JNI-interface and compile it as a shared library (.so) ...
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1answer
454 views

Using assembly to write to a file

I am working with a trading application (reading data from the exchange) which generates a bucket load of data on a per second basis. We have different "log-levels" but even the minimal log-level ...
0
votes
3answers
275 views

C/C++ in applications that do not concern performance [closed]

C is the best language (or maybe the single language) suitable for operating systems, drivers, embedded systems etc. For more complex domains like computer graphics C++ is a better choice. But these ...
8
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1answer
7k views

programming PID loops in C

I'm an electrical engineer that was kind of thrust into the digital world and learning as I go. I'm programming a TI processor to do a PID (proportional-integral-derivative) loop, illustrated by this ...
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7answers
2k views

When should pointers be checked for NULL in C?

Summary: Should a function in C always check to make sure it is not dereferencing a NULL pointer? If not when is it appropriate to skip these checks? Details: I've been reading some books about ...
1
vote
1answer
271 views

Portability: Python's C/C++ libraries/extensions vs JRuby's Java libraries

I've had some discussion with colleagues who chose to go with JRuby along the following line of argumentation: JRuby can make use of anything that is available in Java, ergo such programs are more ...
0
votes
2answers
258 views

Need some advice and feedback on my code's design

I am looking for feedback on the design of my program. I have a shell script call function.sh that defines a lot of helper functions. My intent is to use those bash functions defined in functions.sh ...
34
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2answers
6k views

What is the purpose of NaN boxing?

Reading 21st Century C I arrived at chapter 6 at the section "Marking Exceptional Numeric Values with NaNs", where it explains the use of the bits in the mantissa to store some arbitrary bit patterns, ...
3
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2answers
1k views

Library design: provide a common header file or multiple headers

There are essentially two camps of library designers concerning the design of the final header file inclusion: Provide a single header file that includes every other header file that makes up the ...
1
vote
1answer
142 views

Implementing a sort of navigation system

So I am undertaking a project which does navigation sort of thing. So here is how the problem statement looks like. Say, given a map of a floor, with different rooms, now somehow, this information is ...
2
votes
1answer
385 views

Where did the T in wchar_t come from?

In many native types, a common suffix (and sometimes prefix) of t or _t is used to denote platform-independent types (such as wchar_t, int32_t, etc.) What was the logic behind the letter t as opposed ...
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2answers
779 views

Why aren't there modern C IDEs? [closed]

Why weren't the features present in modern IDEs for Java & C# (Intellij IDEA, Visual Studio, eclipse) developed in (earlier) IDEs for C language? I mean I don't know any IDE which has modern ...
4
votes
4answers
25k views

Initializing char array with string

I don't remember how I got to the thread, but I was reading its replies and one of them states that you should never initialize a char[] with a string literal. My question: Is initializing a ...
1
vote
1answer
421 views

Parallel computing using xcode

I'm making mandelbrot fractals in C using Xcode and I want to use parallel computing but everything I've tried so far doesn't work. Such as This Question and other how to guides. Whats the easiest way ...
4
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2answers
3k views

Low Latency Unix/Linux

Most low latency/high frequency programming jobs (based on job specs) appear to be implemented on unix platforms. In a lot of the specs they make particular request for people with "low latency linux" ...
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2answers
448 views

How to practice programming? [closed]

I've been a PHP developer for 5 years now. Before I started working in that field, I've been practicing at home. I've created my own CMS, so I could actually show some of my code to the potential ...
7
votes
5answers
953 views

Is code duplication a necessary evil in C?

I'm rather new to C, and I'm wondering if code duplication is a necessary evil when it comes to writing common data structures and C in general? I could try to write a generic implementation for a ...
21
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2answers
1k views

What does it mean to expose a C++ code publicly as a C API and what are the advantages of doing it?

I often hear people say that C++ programmers should expose their library's/product's public API as a C API. What does that mean and what are the advantages of that?
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1answer
1k views

Streaming data from a microcontroller to a server? [closed]

Edit *We have a heart monitor hooked up to to an msp430 with a roving networks wifi module. I would like to connect send some type of a datastream to a webserver so that someone could watch it ...
2
votes
6answers
4k views

What is a 'Null Terminated String' ?

I have just started reading C++, and I came across a term "Null Terminated String", I read about it but couldn't understand what it actually stands for. I also want to know what is the difference ...
6
votes
1answer
260 views

Difference between language virtual machine and emulating vm?

I'm having a hard time understanding the difference between an emulation virtual machine and a language vm. I started with the research and implementation of an emulation virtual machine. Primarily ...
4
votes
2answers
277 views

What is the lifecycle for loading a Linux Desktop Environment?

I'm looking into delving into a bit of custom OS work (and yes I understand that doing any development at the DE level or lower on an OS is extremely complex and not a light thing to undertake, ...
0
votes
3answers
665 views

How to efficiently store IP addresses? [closed]

Background I have a requirement where I need to remove a few nodes in a network based upon a command given by the user. To keep the nodes from transmitting or receiving data I thought of changing its ...
11
votes
8answers
1k views

Does low latency code sometimes have to be “ugly”?

(This is mainly aimed at those who have specific knowledge of low latency systems, to avoid people just answering with unsubstantiated opinions). Do you feel there is a trade-off between writing ...
3
votes
3answers
276 views

is Microsoft LC random generator patented?

I need a very simple pseudo random generator (no any specific quality requirements) and I found Microsoft's variant of LCG algorithm used for rand() C runtime library function fit my needs (gcc's one ...
4
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1answer
229 views

unseen/unknown function definition in linux source

Can any one please explain this piece of code I found in the linux kernel source. I see a lots of code like this in linux and minix kernel but dont seem to find what it does (even if C compilers ...
2
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8answers
712 views

tips, guidelines, points to remember for rendering professional code? [closed]

I'm talking about giving clients professional looking code. The whole nine yards, everything you hardcore professional highly experienced programmers here probably do when coding freelance or for the ...
14
votes
7answers
2k views

Why does Clang/LLVM warn me about using default in a switch statement where all enumerated cases are covered?

Consider the following enum and switch statement: typedef enum { MaskValueUno, MaskValueDos } testingMask; void myFunction(testingMask theMask) { switch theMask { case ...
0
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3answers
319 views

Which language is more suitable heavy file tasks?

I need to write a script (based on basic functions) to process /image/audio/video files. The process is mainly filesystem tasks and converts. The database of files has been stored by mysql. The script ...
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votes
2answers
389 views

What are the ways to start making actual/real-world programs using Java/C++ to excel my Programming Skills? [duplicate]

Possible Duplicate: How do I improve my coding skills? How I do become a better programmer as a junior developer The programming that we learn at university is not that vast, like those ...
13
votes
12answers
3k views

Why do operating systems do low level stuff in C and C++? Why not just C++?

On the Wikipedia page for Windows, it states the Windows is written in Assembly for the bootloader and task switcher, and C and C++ for kernel routines. IIRC, you can call C++ functions from an ...
4
votes
2answers
621 views

How can I combine C/Fortran with JavaScript?

I'm working on a project where I need heavy numerical calculations to be real-time visualized with something flexible like D3.js. Are there frameworks out there that would let me painlessly achieve ...
1
vote
3answers
246 views

Random List of numbers in C

I have just started a C programming course and so far have only done the basics like printf, read a little on variables etc on the course book. The teacher has tasked us with writing a program that ...
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votes
1answer
214 views

C Minishell Command Expansion Printing Gibberish

I'm writing a unix minishell in C, and am at the point where I'm adding command expansion. What I mean by this is that I can nest commands in other commands, for example: $> echo hello $(echo ...
6
votes
2answers
372 views

Are there any reliable solutions for annotations/reflection/code-metadata in C?

Not all languages support java-like annotations or C#-like attributes or code metadata in general, however that doesn't mean it is not possible to have in languages that don't have this. An example ...
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votes
4answers
801 views

C simple arrays and pointers question

So here's the confusion, let's say I declare an array of characters char name[3] = "Sam"; and then I declare another array but this time using pointers char * name = "Sam"; What's the ...
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votes
3answers
632 views

Why does an unsigned int compared with a signed character turn out with an unexpected result? [closed]

Why does the following code output y>x when clearly 1>-1? unsigned x=1; signed char y=-1; if(x>y){ printf("x>y"); } else { printf("y>x"); } Please explain this result.
2
votes
1answer
272 views

Brief explanation for executables in a GNU/Clang Toolchain?

I roughly understand that cc, ld and other parts are called in a certain sequence according to schemes like Makefiles etc. Some of those commands are used to generate those configs and Makefiles. And ...
1
vote
4answers
1k views

Should I use C style in C++?

As I've been developing my position on how software should be developed at the company I work for, I've come to a certain conclusion that I'm not entirely sure of. It seems to me that if you are ...
0
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2answers
284 views

How to access an encrypted INI file from C on an embedded system with little RAM

I want to encrypt an INI file using a Delphi program on a Windows PC. Then I need to decrypt & access it in C on an embedded system with little RAM. I will do that once & fetch all info; I ...
8
votes
4answers
2k views

Is it important to know C/C++ for Android development?

Is it possible to use only Java (without C++ /NDK) for building good, fast, beautiful Android apps (including 3D development)? When I look for Android developer position requirements (vacancies), I ...
1
vote
1answer
55 views

In GSL, why do some functions take a “workspace” argument?

In certain functions in GSL (GNU Scientific Library), some functions take a "workspace" environment as an argument. For example, gsl_poly_dd_taylor from this page. Why? Wouldn't it be easier for ...