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

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1answer
239 views

Question about switch-case statement [closed]

What happens, and does code work properly if we write switch-case structure like this, why its not good to write code like this? I'm porting some firmware and have switch-case statement interrupted ...
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1answer
111 views

Equivalent translation of Asynchronous behaviour in C

As a follow-up to my other question, if one were to build a general-purpose translator from a language that has support (be it with an external library or otherwise) for asynchronous behaviour to a ...
3
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1answer
1k views

Implementation of Asynchronous function call in C

I took it upon myself recently to work towards making a general-purpose Translator to automatically translate js programs into C, but I got stuck when thinking of asynchronous behaviour. Using ANSI / ...
7
votes
8answers
1k views

Structuring Procedural vs OO code

I have spent the vast majority of my programming career using Java and very OO based C++. I am really interested in learning to think more procedurally, so I have been starting to do some practice ...
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votes
1answer
86 views

how integer type can handle text stream (getchar()) in C? [closed]

While going through C programming by Ritchie and kernighan, I came across the following code. #include<stdio.h> int main() { int t; t = getchar(); while ((t=getchar()) != EOF) { ...
3
votes
2answers
1k views

How does printf write to stdout? [closed]

I've been looking for an answer to this for a couple days, and all of the results I've come up with are about how printf accepts an arbitrary number of arguments. How does printf write to stdout? ...
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votes
2answers
144 views

In C is it possible to change http requests to https [closed]

Long story short I've got this package that currently has a security risk where credentials are sent over http and I need to convert them to https but I currently lack the knowledge to do so. Could ...
1
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5answers
8k views

How to share memory between applications written in C/C++

I'm going through a program written in C/C++ for control in robotics. Basically, three different programs run at the same time, and they communicate via shared memory. Google-ling around I found ...
20
votes
8answers
1k views

Is directly using Make considered obsolete? [closed]

So I have been coming across many comments/posts/etc regarding creating makefiles directly, and how it is a silly thing to do in 2015. I am aware of tools such as CMake, and I actually use CMake quite ...
0
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0answers
97 views

Abstract Web API from validation and configuration management in embedded system

Im working with embedded Linux for a router. There is a web GUI for the user to configure router options. When user fill a web form this is submitted to a web server function that is responsible of ...
0
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1answer
163 views

Has pre-increment operators become that common? [closed]

Bit of background to explain the reasoning: I've been programming for a good while, but took a break between 2012 and 2014 for other stuff. Before that break, I would hardly ever hear about "++i", let ...
2
votes
1answer
301 views

How can C++ make it possible to use dynamic container classes even in embedded systems?

How can C++ make it possible to use dynamic container classes even in embedded systems? Background info: I've been working with PIC (C) and AVR (C++) processors and at the moment (PIC C) I'm ...
0
votes
2answers
163 views

Idiomatic C API with regards to pointers

I am trying to get a better understanding of how one would structure an API in C. I create a struct Person I have a init function that sets data on that struct I have multiple "helper" functions ...
1
vote
3answers
590 views

Alternative to goto-statement in this case? [duplicate]

Currently I am using gotos for closing handles and general cleanup if an error occurs. Since I don't want to nest all the ifs and a function for cleanup would require a return besides the cleanup(); ...
2
votes
2answers
142 views

Function naming design in a C Library

I'm writing a C (c99) library that operates on strings. I'm having a design problem writing functions that will perform in different modes. For example; the Find function can search for: the first,...
-3
votes
1answer
536 views

Passing Parameters to pthread_create [closed]

I have a structure named graph. graph *G; Now I create memory of size of structure using malloc and the start pointer is stored in pointer G. G = (graph*)malloc(sizeof(graph)); My question is ...
5
votes
2answers
908 views

Should I always return an error code from C functions?

I have the following code in many places in a large application: if (datastruct.data_ok && cur_time > datastruct.start_time && cur_time < datastruct.end_time) { ...
0
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0answers
335 views

Writing Z80 table based assembler/disassembler

I have a long-term project: DIY computer with various processors. One of my wishes not only make hardware, but software too. So I started from assembler/disassembler for Linux, though there is a lot ...
0
votes
1answer
153 views

Can i create a function with variable parameters in C?

I've always wondered where a single function such as printf(); can take in variable parameters and provide the right results. For example, printf("Number is %d",a); which has two parameters, and ...
17
votes
9answers
4k views

Can you “stop” a C program from being reverse engineered? [duplicate]

I'm sure that many of the middle to high level languages can be reverse engineered. But if a C program can be reverse-engineered, and turned back into editable source code, how do I discourage such a ...
2
votes
3answers
423 views

Will C compiler attach the whole object code of the header file?

When you compile a C source code does the compiler convert the whole header file to object code or just the functions of the header file you use? Like for example, in the header file #include stdio.h,...
1
vote
2answers
211 views

In C, what is an unconditional jump?

I have to fill out some documentation regarding a C project i worked on. One topic is whether I used "unconditional jumps". As far as I know, a "break" statement counts as a jump. And I have a few of ...
2
votes
2answers
1k views

Returning multiple values from a c function using pointers; style of parameter list

What is good programming style for writing C-language functions and function calls to functions which return pointers? For example, if I have a function my_function which return two integers through ...
1
vote
0answers
94 views

How to use an enumeration type, when the values are not known at first?

We have a project, that consists of a cluster of C source code, a C library and a C++ library. The C++ library is dependent only upon the C library, or at least that is what I am trying to achieve. ...
0
votes
2answers
96 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 ...
13
votes
2answers
815 views

Java has the JVM, what does C have?

I know that C has a compiler but what determines execution performance? For example in an if else block, what if the code just had all ifs instead of if elses, what determines that all the ifs will ...
2
votes
2answers
605 views

Should I use multiple state machines for a layered protocol?

When implementing a layered communications protocol are layers commonly implemented as state machines? I have an implementation of PMBus I am currently working on for an embedded device. I have a ...
0
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2answers
137 views

Trouble understanding simple recursion in c [duplicate]

My function: int num(int x) { if(x>0) num(x-1); else return 0; printf("%d",x); } This function takes a input x and prints the numbers from 1 upto x.I can't seem to ...
61
votes
5answers
13k views

Why are there so few C compilers?

C is one of the most widely-used languages in the world. It accounts for a huge proportion of existing code and continues to be used for a vast amount of new code. It's beloved by its users, it's so ...
4
votes
4answers
1k views

Is a makefile really needed

I have been programming in c/c++ for a while now, and I have never once used a makefile. I know that it is supposed to be useful when you are dealing with a large project, but I have always been able ...
4
votes
2answers
1k views

How do you usually compile C/C++ source code ? (Large code bases) [closed]

It's been quite some times since I began learning C and C++ but I've been very limited only to the Windows platform and the Visual Studio environment. Recently, I wanted to look into some open source ...
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1answer
255 views

Understanding the solution of exercise 1.16 of K&R as given in the “The C Answer book”

The exercise 1.16 in K&R's book asks, Revise the main routine of the longest-line program so it will correctly print the length of arbitrary long input lines, and as much as possible of ...
0
votes
1answer
1k views

How static functions are better than Class Methods in Objective-C [closed]

I was going to through this post by Mattt Thompson in which he mentions that Static functions are nicer than shoe-horned class methods I just don't see any flaw with Class methods in Objective-...
0
votes
2answers
137 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 ...
0
votes
3answers
90 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 ...
2
votes
1answer
432 views

An embedded C developer wishing to interface some code with a web page

Okay, so as the title says, I'm an embedded C/C++ developer. Right now, I'm working on a project that involves a client/server C application. The server side of the application is running on ...
4
votes
1answer
1k views

Functions returning strings, good style?

In my C programs I often need a way to make a string representation of my ADTs. Even if I don't need to print the string to screen in any way, it is neat to have such method for debugging. So this ...
3
votes
2answers
249 views

Place variables frequently used by the same function on the heap?

Say that I have the following situation: void myFunc() { int x; //Do something with x } "x" is placed on the stack which is no doubt fast. Now, "myFunc" is called very frequently, lets say ...
0
votes
1answer
163 views

C-library - newbie guide

I have been asked to provide a C-library of my code (which I have written in a high-level language). I will hire a programmer to implement my code in C. I would like a short introduction to what a "C-...
4
votes
1answer
660 views

Transpose a matrix without a buffering one

How is it possible to transpose a MxN matrix without using a "buffering" matrix? In the latter case it's easy and quite the "classic" approach... Given a matrix[M][N], I would like to put it into a ...
3
votes
1answer
382 views

Structure of stack of a function call

I've been reading Aleph One's paper on Smashing the Stack for Fun and Profit. I wrote down example1.c from his paper, modified it a bit to see what the stack looks like on my system. I'm running ...
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votes
1answer
81 views

How to create user defined conditional statements in c? [closed]

I have two stacks s1 and s2 with numbers stored in them. I have a function(say comp) which compares the numerical values of s1 and s2. I want to know if it is possible to modify the function so that ...
0
votes
3answers
319 views

Understanding the concept of “arguments” and “parameters”

In the third last paragraph at page number 26 of the ebook "The C Programming Language" the author(s) say, "We will generally use parameter for a variable named in the parenthesized list in a ...
3
votes
3answers
245 views

sorting / merging hashtable

For my project I have a hashtable with 1M buckets (sometimes more). Each bucket contains lots of values and they are stored sorted in a dynamic array. I am looking for easy enough way to store all ...
1
vote
3answers
330 views

Exercise in 1.6 C by Kernighan and Ritchie [closed]

I'm using this book by Kernighan and Ritchie, on the chapter about character input and output and file copying, I'm totally lost as to what this chapter is talking about. This question may seem too ...
0
votes
2answers
613 views

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 ...
4
votes
4answers
2k views

int * vs int [N] vs int (*)[N] in functions parameters. Which one do you think is better?

When programming in C (or C++) there are three different ways to specify the parameter in a function that takes an array. Here is an example (implementing std::accumulate from C++ in C) that shows ...
1
vote
2answers
152 views

How much does C help you in other languages? [duplicate]

How much does learning C to moderate level help you as a programmer. For example, does being competent in C make it easier to pick up languages as time goes on and get a better understanding of them?
1
vote
1answer
256 views

How to represent “class” data type in C or any low level language? [closed]

I'm writing a simple language compiler,currently it's support functional programming only. I want to support OOP concept, but I don't know how exactly I can represent an object ? just where to start ....
3
votes
2answers
834 views

Is it always safe to shift bool values?

I stumbled about a Cppcheck warning (an inconclusive one), that I mistakenly used & instead of &&: /// @param code identifies the command. Only the lower 16 bits of are being processed ...