C is a general-purpose computer programming language used for operating systems, games, and other high performance work and is clearly distinct from C++. It was developed in 1972 by Dennis Ritchie for use with the Unix operating system.
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Quadratic probing and hashing - search for words in text files
I created a program for a college class. After I got it working, I wanted to improve it. As a beginner, it is probably a mess.
Description
It uses a HashFunction ...
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20 views
Securely Delete All Drive Data
When giving away or selling a PC, one should be careful not to send personal data with it. I'm in such a situation and was using dd if=/dev/urandom of=/dev/sdb bs=8M...
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3answers
50 views
C strlcat implementation
I have to reproduce some basic functions in C and one of them is strlcat.
After reading the man and testing the strlcat from <bsd/string.h> library, I wrote ...
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1answer
47 views
Red light, green light… kinda
For an assignment I had to create a client and a server that communicate over a well known FIFO. The server is required to use three threads to serve the client, managed by a semaphore.
The code was ...
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1answer
46 views
Win32/C: Notepad wrapper that automatically converts Unix line endings to Windows line endings
At my work we're dealing with a lot of PHP files written by a third-party company and sometimes we want to "quickly look at" these files in Notepad rather than having to open up a full IDE.
The ...
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1answer
47 views
Waiting for input with timeout
When my program begins, I want to allow the user to hit a key to enter debug mode for one of the modules. Many of the solutions (involving alarm(), in particular) ...
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Linux performance drawback when networking from two pthreads [on hold]
I have a server application that receives requests in one thread and responds in another. I am using thread pools of pthread-s for both receiving and sending. The performance is not that bad, however.....
3
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1answer
50 views
Concatenate variable number of strings
I am learning C on my own. This is not an assignment. I am trying to implement a function that takes a variable numbers of strings and concatenate them in a new string. It works, but I feel it is not ...
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1answer
24 views
Short header file for safe CLI input handling in C
Proper input handling is a pain in the butt in C, so as part of a project of mine, this header is used to handle reoccurring command line input tasks such as input loops, reading lines and tokenizing ...
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25 views
C implementation of singly linked list [closed]
I am beginner in C and in this program trying to implement a singly linked list in C. This implementation includes the following functionality :
adding elements to end of list
adding an element at ...
1
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0answers
27 views
A-Eye: Analysing Eye tracking Data
I'd appreciate your advice.
data file: https://drive.google.com/open?id=0B_UEM0TEmA_yeHJBZ0dzbV9Ca2c
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2answers
64 views
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1answer
28 views
String tokenizing with arbitrary token count in C
I am building a small program for input handling so I can conveniently parse lines and tokenize strings. The token handling works right now but I have to malloc a lot in the main() to make it work. ...
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1answer
33 views
Select comparison function for sorting based on type information
So I'm working on a patch for the python interpreter where you go through the list and look at the types of the elements and try to use optimized special-case comparison functions that are much ...
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4answers
110 views
Factorials, loops, break and professional code
The program below correctly calculates factorials, until the limit for an unsigned long long integer is exceeded.
My question has to do with loops and exiting ...
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0answers
18 views
C Simple Database [closed]
This is an assignment from a book that I am follow and I am trying to complete the extra credit part of the assignment which allows for dynamically allocated records. The path that I have chosen for ...
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2answers
41 views
Config file to struct in C
I have a struct OPTS which contains a few chars and char[]s. I also have a file opts.cnf ...
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1answer
96 views
Reference Counting in C99
(I created a GitHub repository; there are few improvements as suggested by other users in the comments)
As we know, C99 has no garbage collector. To address the problem of manually deallocate objects ...
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0answers
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Coding frogger for VBA using DMA, but only displays a white screen. [closed]
Trying to code frogger on the visual boy advance in c with DMA. I honestly don't understand why it won't show my images. Here is my myLib.c file with the drawing functions:
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4
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1answer
64 views
Using bitwise operators with (unsigned long) instead of bitfields
Here is my solution to Programming Exercise 15-7 from Stephen Prata's C Primer Plus, 6th Edition. This problem asks the reader to:
15-7
Write a program with the same behavior as described in ...
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4answers
112 views
Calculate the number of palindrome numbers in the given ranges
I've written a program that calculates all of the palindrome numbers in the given range, but the code is slightly slower than needed. I've tried to improve algorithmic complexity to the best of my ...
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3answers
462 views
Counting the number of “on” bits in an int
Here is some code I wrote as a solution to Programming Exercise 15.3 in Stephen Prata's C Primer Plus, 6th Edition. It is probably worth pointing out that the title of the chapter is Bit Fiddling. The ...
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1answer
58 views
K&R 2.6 Exercise setbits(x,p,n,y) function
Write a function setbits(x,p,n,y) that returns x with the n bits that begin at position <...
5
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1answer
706 views
C program circular array rotation
I'm trying to solve a Hackerrank problem where you perform k array[n] rotations, and at the end, ask for ...
5
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2answers
178 views
20×20 Game of Life in C
I am new to C, but have experience with Python and R. The following code implements the Game of Life and represents my first finger exercise in C. I would like to have some feedback regarding the ...
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2answers
375 views
Small part of an INI parser
I know there are probably thousands of INI parser implementations in C.
Nevertheless I want to implement one to learn the art of parsing grammar.
I just wrote a small piece of the INI parser and ...
4
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1answer
42 views
Simple file server for GET requests
I recently made this simple server in C for Linux systems and was wanting to get another set of eyes on it for a review of the design. I am new to socket programming and used a textbook from school to ...
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0answers
84 views
Stack in C and Python
I just finished writing Stack in C and Python and I want someone to review it for bad code, missing features and possible improvements.
Here is the C code:
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1answer
225 views
Brainfuck compiler with tcc backend
I wrote simple compiler for Brainfuck with tcc backend (dont ask for assembler/assembly code generator!). It's output runs incredibly slow. Even Hello World program takes a LOOONG while to execute. I ...
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1answer
44 views
Simulating dynamic polymorphism in C
This code snippet is a research attempt to find means for dealing with dynamic polymorphism (in C): two or more related "classes" share a common interface. Here is my best shot:
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3answers
211 views
A program to represent a coin amount using the smallest number of coins
Recently, I was learning about greedy algorithms. One example that was given was an algorithm for exchanging a given money amount using the smallest number of coins. After the lecture, I wrote a C ...
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17answers
12k views
Disproving Euler proposition by brute force in C
I wrote a little bit of code to brute force disprove the Euler proposition that states:
$$a^4 + b^4 + c^4 = d^4$$
has no solution when \$a\$, \$b\$, \$c\$, \$d\$ are positive integers.
I'm no ...
3
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1answer
62 views
Sum of Absolute Differences algorithm implementation
Those unfamiliar with that algorithm can have a deeper look here, in a few words, there are two arrays where you subtract each element ar1[0][0]-ar2[0][0] and add ...
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2answers
63 views
IPC using pipes
I have simulated the conversation between a caller and receiver using fork and pipe. The parent process is the receiver and the child process is the caller. Each message is terminated by a newline.
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3
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1answer
40 views
Basic memory pool, alignment, thread safety
Mainly for practicing purposes, I'm trying to implement a simple, yet efficient memory pool. It's basically a linked list that is able to grow, with fixed sized members. Each node has a flag if it's ...
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2answers
967 views
Very simple stack in C
I'm starting to learn C and thought it would be a good idea to try and implement some data structures. I started with a very simple stack and would like to hear some opinions.
Stack.c
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3answers
239 views
Removing multiple slashes from path
I have been trying to write a sample code block to remove multiple backward or forward slashes from a path (e.g. //a//b should be ...
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2answers
35 views
Inserting into a binary search tree in C
I am in the process of refactoring this simple binary search tree code responsible for adding new values:
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2answers
100 views
Draw a centered circle
I've written this program that, renders a circle in the middle of the screen. It's been written in a very elementary way.
Any suggestions on principles or techniques? Or any more optimal or efficient ...
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1answer
84 views
Convert hex to base64, part 2
Original question
Reimplemented solution following JS1's answer.
Changed bit string hack to bitwise operations to get the corresponding base64 index values.
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2answers
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Find first non-repetitive character in a string
The original task was to find the first non-repetitive character in a string.
Every now and then I read questions here on Code Review and try answering them myself, and as such I stumbled upon this ...
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1answer
61 views
Convert and print Celsius to Fahrenheit from certain range of values
I just started learning C, and got to the "for loops"—where an exercise is given to convert Celsius to Fahrenheit ( from -50 to 1000 with a step of 20 ), and print the values. I decided to play with ...
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2answers
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Get a floating point number from a string with a finite state machine
I wanted to restart the big-float project I had paused the moment I suddenly realized that the implementation of the main four rounding modes (which I postponed so long, that I got all of the IEEE-754 ...
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1answer
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Simple but (hopefully) safe C nodes for data structures
Nodes will be for simply linked lists, circular lists, maybe later on extending them to work with graphs. I'm trying to be as defensive as possible, will this leak memory? It runs perfectly I'm just ...
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1answer
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Trying to build a bare metal stack on the stack [closed]
I'm trying to implement a stack data structure, but not on the heap but using the stack. Also not using any Node or Element struct but raw ints. Is this feasible? This is my code (with debug printfs) ...
4
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2answers
131 views
Dynamic Array container in macros
The code below is an attempt to mimic std::vector from the C++ standard library in the C language.
The implementation is purely macros, in the C99 dialect, and ...
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1answer
30 views
A telephone book command line program in ANSI C - follow-up 2
(See the previous iteration.)
What does this program do?
This program gives you a command line interface for managing your personal telephone book. The program supports three actions:
Adding a ...
2
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1answer
43 views
Multi platform ASCII spinner in C
Okay I've just finished writing a nice tiny C program to have an ASCII spinner (works on Windows and POSIX). I'm quite new to C, so any suggestions would be great. This is designed to be a small ...
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2answers
152 views
Swap first and last name in C
I took an entire line of input in the form of a string, and tokenized the string into substrings and obtained the first string as the first name and the second as the last name. This program as it ...
