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

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What kind of applications are built using C [closed]

I studied C programming about ten years ago, whiles in Uni,however I would like to pick it up again. I'm looking at developing secure applications that utilize cryptography. Would C be the right ...
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143 views

(almost) Pure C instead of C preprocessor [closed]

Why isn't (almost) pure C used instead of the C preprocessor? Sure I understand it would be a little more verbose. For example: #define PI 3.14159 If we had regular C as preprocessor language, the ...
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205 views

C Linked List Implementation Pointer vs. Pointer-to-Pointer Consistency

To get some practice in C, I'm writing some basic functions for operating on a linked list of ints. I started out with functions that accepted as a "list" a pointer to the head node. Now, I find ...
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usage of double pointers and n pointers?

I am familiar with basic C pointers. Just wanted to ask what is the actual use of double pointers or for that matter n pointer? #include<stdio.h> int main() { int n = 10 , *ptr , **ptr_ptr ; ...
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Global variable in a Linux shared library

Suppose we have the following setup under Linux, .so library named "libcnt.so" and 3 user space apps: "app1", "app2", "app3". This library does 1 simple thing, it says to the app (app dynamically ...
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Looking for a certain datatype if it exists

I'm looking for the kind of a certain datatypes. The main idea of this datatype is to describe a productionline containing several steps. Each step should be represented as a "vertex" containing an ...
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2answers
119 views

How much warnings in C to enable?

This is a tiny project of about 2000LOC. It is being compiled with -Wall. Now, I tried adding -Wextra. Two things happened: Some minor but valid warnings popped up, e.g. Comparing signed with ...
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868 views

Algorithm for recursive evaluation of postfix expressions

I'm reading Sedgewick's book on algorithms in C and I'm looking for an algorithm to evaluate postfix expressions (addition and multiplication only) without using a stack. I tried to implement one but ...
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3answers
283 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 ...
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1answer
110 views

Introducing function waypoints to protect device [closed]

Defining a magic pointer or counter inside a program / class and checking for a fixed value before executing critical commands is a way to generate a barrier against wrong execution. This check is ...
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150 views

Alternative to printing debug information to stdout\stderr [duplicate]

I currently have a long running application on an embedded Linux environment and all debug messages are currently being outputted to stdout using printf. This isn't ideal for special users who ...
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3answers
1k views

comparison of floating point numbers vs. comparsion of Integers in C [closed]

Does comparison of floating point numbers takes (considerably) longer time than comparison of Integers in C? I just wrote a C program of heap sort to sort floating point numbers. I am on ubuntu ...
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171 views

How can I handle this string concatenation in C in a reusable way

I've been writing a small C application that operates on files, and I've found that I have been copy+pasting this code around my functions: char fullpath[PATH_MAX]; fullpath[0] = '\0'; ...
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2answers
89 views

Should functions be prepared for overlapping buffers?

So I have a function in C like this: void crunch(const char *in, char *out, size_t inLen, size_t outLen) { //... } If the two buffers overlap, the function may mess up the input buffer as well, ...
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1answer
226 views

Is TCP message order still guaranteed when using async IO

Here the scenario I'm imagining. Two messages are transferred, both will require 2 packets each (I know you don't deal with packets directly with TCP, but on the IP level each message will consist of ...
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2answers
160 views

What are and how do (data-) types work?

What is a "variable"/data type? How does a compiler / interpreter handle types? My specific concern has to do with the different types in lower and higher level languages. For instance in Python, ...
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635 views

Is it a good idea to const-qualify the fields of structure in C?

Consider the following program: #include <stdlib.h> #include <stdio.h> typedef struct S_s { const int _a; } S_t; S_t * create_S(void) { return calloc(sizeof(S_t), 1); } void ...
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178 views

Perfomance of 8 bit operations on 64 bit architechture

I am usually a Python / Database programmer, and I am considering using C for a problem. I have a set of sequences, 8 characters long with 4 possible characters. My problem involves combining sets of ...
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279 views

How small is the footprint of a small C compiler?

This week I could optimize using a reduced C library that allowed a drastic shrinkage in code size - from about 60 K to about 6 K and then we could load the code in the 8 K on-chip memory of an FPGA ...
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2answers
760 views

Better design for a generic doubly linked list around which I plan to make different wrappers?

I am currently writing a C code for a doubly linked list(dll) around which I want to write wrapers for implementing stack, queues etc. instead of writing separate codes for all of them. I'll be ...
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655 views

Giving a double type for sqrt library function in C

The C Programming Language by Ritchie says that: The library routine sqrt expects a double type and will produce nonsense if inadvertently handled something else. So if n is an integer, we can use ...
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1answer
225 views

Did I answer this correctly and concisely? [closed]

By email I just answered my brother who is learning computer programming that C++ and Java are more similar than C and C++ even though C++ is nearly a superset of C. Do you agree? AFAIK Stanley ...
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436 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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2answers
382 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 ...
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5answers
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Learning basic algorithms - better C or C++? [closed]

I'm studying fundamental algorithms (quicksort, mergesort, binary trees, etc..) and I'm going to re-code every algorithm by scratch to learn how they work. Should I code them in C or C++? I think with ...
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1answer
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Is it possible to call a Javascript function from C?

I'd like to find a way to call Javascript functions from C. Are there any language bindings available for this purpose? I'm trying to make a library of Javascript functions accessible from C. ...
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211 views

Tool to visualize values from variables during the execution of a program in C

I just need to see what is stored, in realtime, in some particular variables and struct used by an application written in C. I need something like the stack tracer that comes with the ADT plugins for ...
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3answers
164 views

Roadblock-confused about structure of program

I'm new to programming, and I'm working in C. I know that this is structured programming but if I use blocks, say for local variables: { int i; for(i=0; i<25; i++){ printf("testing...\n"); ...
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1answer
3k views

C programming in Windows 7 [closed]

Which is the best book and what are the best tools for C programming in Windows 7? Would using C in any way hinder me when it comes to using the Windows API as opposed to using C++ or C#? I would ...
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1answer
375 views

want to switch from Enterprise software development to C programming [closed]

I'm a software engineer with 5years of IT experience in a reputed (tier 1 indian MNC) service based software company in peoplesoft and informatica. But unfortunately i'm interested to switch to a ...
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2answers
109 views

Organizing C++ Components [closed]

In my current company we've brought the discussion about how to organize most of our different C++ components considering the following requirements: There might be interdependencies between ...
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227 views

Socket Connecting to Large number of IPs

I have a text file of ~600 CIDR notation IP blocks which, when expanded, amount to ~17.5M IP addresses. I need to socket connect to each one. If it connects, I add it to a "live" list, if it returns ...
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69 views

Macro guard in Objective-C

I have noticed that many famous libraries written in Objective-C (eg. AFNetworking) use the macro guard inside their header files. Im aware that the #import directive, which works exactly like ...
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111 views

comparison of an unsigned variable to 0

When I execute the following loop : unsigned m; for( m = 10; m >= 0; --m ){ printf("%d\n",m); } the loop doesn't stop at m==0, it keeps executing interminably, so I thought that ...
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337 views

Algorithm for base-conversion in C?

I put in this code which does what it's supposed to do, but perhaps there is a better or more general approach? I'm converting a 4-digit base 10 number e.g. "11" to base 16 e.g. "17" (which gets ...
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2answers
415 views

Shared source file between two parts of project [closed]

I have the following sort of directory structure: part1 build src part2 build src Now I have a header file that I would like to include in both parts of these projects, it will ...
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931 views

Dynamic initialization, how does it work?

I have a question regarding dynamic initialization. Example code void main() { int a = 100; //Statement1 //Statement2 ... float b = 6.32987; //StatementA ... return; } The StatementA allocates ...
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1answer
125 views

The keyword const and the linker file

If I declare in a header file, for example, extern unsigned long * Ptr; and the value of this pointer Ptr in the linker file. Will this adrress be 'constant'? Can I change its value ?
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Example(s) of “A subscript ([ ]) expression that does not evaluate to an array” in C

I think I have never seen a [] that doesn't mean array in C. Background: I was reading about l-values and r-values here: http://msdn.microsoft.com/en-us/library/bkbs2cds.aspx and there it says so. I ...
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4answers
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How should I go about developing some basic C/C++ knowledge so that I can grok the concepts written in some Classic software programming books? [closed]

I know Java and JavaScript pretty well. I have never really worked on C/C++. But at this stage of my career I feel that the fact that I do not have adequate knowledge on C/C++ syntax(especially ...
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1answer
1k views

Why nginx's http parser doesnt use regular expressions?

I see the http parser written by Igor Sysoev for nginx does not use regular expressions https://github.com/joyent/http-parser What could be the main reason for such design decision? I guess I could ...
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3answers
97 views

How to manage intermediate outputs efficiently?

I am implementing a C preprocessor in C... I have the three functions: trigraph replacing function Line splicing function comment removing function However these functions work separately on ...
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2answers
691 views

tcp retransmission queue

I'm trying to understand how tcp retransmission queue works so I can implement it in my application that uses TCAP over SCTP. What I understood from the TCP queue is that every message is saved in ...
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2answers
344 views

Asp.net certification [closed]

I want to get my certification in .NET, which certification is the best for me? For the past 8 months I have been working in the .NET 3.5 and 4.0 frameworks. How can I grow myself by appearing this ...
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2answers
83 views

forking but not exiting

It is normal for the child in a fork() to call exec() or _exit(). Are there any realistic scenarios where the child might return from the function that called fork() instead? void foo() { pid_t ...
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3answers
47 views

Data inter-exchange with C

I'm developing a system in which a C coded TCP server is listening for new connections from clients, on connection parse the data & store into database. I'm familiar with JSON, and would like to ...
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214 views

boolean operations in C using bitfields

I am trying to implement boolean data type in C. Basically, I am working with sets. The following code can be used to access each bit but I am unsure whether I can represent sets using this method. ...
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230 views

distributed computing with remote hetrogenous machines

The way i am doing it now is using boost::asio TCP sockets handling everything manually with a main server that orchestrates the processes between the available machines, but the number of machines ...
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1answer
584 views

Multi-threaded server

I have written a server/client program in which I am using 2 threads : One to recieve data continously and Other to send data as the user writes it on screen Problem: I have created the threads ...
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309 views

WINAPI beginner guidance question

I'm learning to develop windows applications using WINAPI and plain C. Now I got a bit confused with all those handles and would like to ask if you guys could teach me some good practices to structure ...