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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Multi Producer - Single Consumer
I have written multi producer single consumer code with bounded buffer. Please review the code for any improvements or mistakes.
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10 views
Parallel Sum Scan using CUDA
I'm learning CUDA (and C to some extent), and one of the algorithms that I am learning is the Hillis-Steele scan algorithm. I wrote a program that performs a simple scan with adding.
I don't really ...
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2answers
75 views
Converting a decimal into a fraction
I have written a small program that converts a decimal number into a reduced fraction representation. I also designed this little program to be fairly robust, so that it can give the correct output ...
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1answer
55 views
Dynamic Programming: Optimal Solution for Number of Ways to get n
A cricketer can score 1, 2, 4 or 6 in a ball. Find in how many ways the player can score a total of "n" runs without hitting 3 consecutive boundaries. Note: Scoring 4 or 6 is considered as a boundary. ...
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1answer
62 views
Simple Lotto Game
I have developed a Lotto Game in C for my Assignment, it allows a user to enter one of the 6 menu options.
From the menu the user would be able to view the numbers they have chosen, another option ...
4
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0answers
20 views
Positioning a file pointer with MPI I/O
This toy code uses MPI I/O to read from a binary file.
It goes through reading:
an ASCII header
the first 10 doubles from an array of 100 ...
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1answer
59 views
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12 views
Split a text file into multiple files at keywords [on hold]
This program only splits the inputted text file in half but I can do it according to line number as well. I need to split according to a word. I have over 200 books in a text file i want to split the ...
3
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1answer
33 views
Pretty print a 2D matrix in C (numpy style)
Works for any 2D matrix represented by a 1D array. Comments and criticism welcome. Also wondering whether the code can be made shorter. It's really messy right now.
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1answer
67 views
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35 views
'Terminated due to time out'. Need help in optimising my code
I am trying to implement dictionary. I would appreciate if you find the flaws in my code rather than changing whole logic.
Attaching the link of Problem
https://www.hackerrank.com/challenges/30-...
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2answers
89 views
Multi threaded text-based tetris game
I have decided to make a game of text-based Tetris in C.
At first I had no idea how to start so I settled for threads.
Each thread moves its own piece down the grid and all the main thread does is ...
6
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3answers
63 views
Four versions of a database-creation function with different error handling
I'm starting a new, small C project and would like to have the safest, cleanest and shortest error handling code possible.
Here is a comparison of different ways to handle errors in the same C ...
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2answers
34 views
Error-checking macro to jump to specified label given a failing statement
I'm starting a new C projet and I want to have the cleanest and shortest error checking code possible.
To that aim, I often use two things :
functions return 0,...
6
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1answer
99 views
C the sum of primes
The challenge is to calculate the sum of the first 1000 primes. The code applies a sieve thanks to past answer, here, and works but I wonder about the flexibility of this solution.
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2answers
144 views
How do I write my multithreading code correctly so that it is faster than a single thread?
I have the following code that I am trying to optimize. I am running it on a Linux machine with 24 cores. I thought I could use multithreading to make it faster, but it's somehow making it way slower ...
3
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1answer
129 views
A small generic array in C
The generic arrays in C I found on the net used either of these methods:
The preprocesser with #define and #include (a lot of ...
4
votes
1answer
37 views
Polymorphic pointers-to-functions whose parameters are void pointers as arguments in C
My question is about this sort of table that's simplified here. Often, I find myself putting this element, (int (*)(const void *, const void *))&strcmp for <...
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2answers
148 views
Dijkstra's algorithm for computing the GCD of two integers, translated from C to x86 assembly
This is the x86 version of a C file assignment (I have included both). We were to convert the C code to assembly. I am rather new at assembly and would really appreciate suggestions and help for ...
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4answers
141 views
Program to display array elements in the ascending order of number of factors each element has
Input:
1000 23 100 26 32
Output:
23 26 32 100 1000
Since 23 has '2' factors and 26 has '4' factors and 32 has '6' ...
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3answers
210 views
Check if 2 rectangles fit in another one, given their length and height
I was very intrigued with the manner to solve this problem. The program needs to know if 2 rectangles fit in another one, considering the lines of the 2 rectangles are always parallel to the other one'...
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0answers
28 views
Tab completion for custom shell
The purpose of the code is to enable tab completion for a custom shell I'm writing. The target OSes are Linux and OpenBSD. I had to make a conditional include that I hope is correct:
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9answers
2k views
Given three numbers, find the second greatest of them
I've just coded this for my country's programming Olympiad. I want to know if this method is a good approach in terms of readability and performance. I would also like to know how to improve it.
Note:...
3
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1answer
40 views
Simple program to insert values in a linked list
I tried to write a simple program using linked list where I just insert the value stored in every node and then through a function print the values.
This is the code:
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votes
1answer
35 views
Segment tree challenge
Here is my implementation of a segment tree with a sample driver file (I didn't make an update function because I didn't need it for what I was doing).
I'm a huge fan of geeksforgeeks, but I do not ...
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1answer
63 views
Max difference between two array elements
Can I get feedback on below code? Problem statement is Maximum difference between two elements such that larger element appears after the smaller number
Would this solution be still considered O(n) ...
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2answers
41 views
My own snprintf implementation in C
I decided to make my own version of snprintf in C. I intentionally changed some things though. My version guarantees the buffer printed to will be null-terminated, ...
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2answers
122 views
Checking that a password contains a '$', a digit, and an uppercase letter
I have this code, which reads in a string password from the user and checks if it has a dollar sign $, a number, and an upper case letter. If it has all three, it ...
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2answers
63 views
Fizzbuzz in C for console
I imagine I get a minuscule performance improvement by doing the %3 as a branch off the %5 rather than the other way round or as an if '%15'. Am I correct about that? (I know there is no practical ...
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3answers
512 views
Snake game in C for Linux console
Please help me improve this code.
Move snake using : a w s d.
(My compiler doesn't support initialization of index variables inside loops, so please ignore this part)
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5
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2answers
314 views
itoa base function in C
This is a function that converts an integer value to a null-terminated string using the specified base and stores the result in a char array that I must allocate (...
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2answers
95 views
A simple and safe implementation for strnstr (search for a substring in the first n characters of char array)
I'd like to suggest the following implementation:
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3answers
121 views
Pausing a loop with a Raspberry Pi 3
I am trying to perform a loop and then stop the loop when the last line of code in the if statement is printed to screen saving on CPU cycles.
I want to start a <...
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1answer
46 views
Recursive spinlock for C using ASM, revision #1
Precursor for this revision here in code-review:
Recursive spinlock for C using ASM
Improvements have been made thanks to forsvarir.
Now I am trying to optimize this lock so it becomes more ...
3
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0answers
57 views
Reduce encoded length of UTF-8 encoded Ruby string in C extension
I'm writing a Ruby extension in C. It's a string processing module working on UTF-8 encoded strings only.
One method, full_width_to_ascii!, converts full width ...
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2answers
63 views
Processing trip route table in C
In fact, this is a group assignment for our C programming lesson, but seeking help from others is not considered cheating.
The goal of the following code is to:
Sort the data in ...
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2answers
32 views
Small Poker program rewrite
I had already put up code for review a small poker program but I have rewrote it utilizing a more appropriate data structure.
How would I compare Poker hands accordingly?
Full source repo
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2answers
28 views
Sorting structures lexicographically
I am swapping structure lexicographically by name.
Is there any way to improve the code when the structure entries are heavy.
Here is the code
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1answer
134 views
Printing fizzy lines
Challenge
Given a test case print out a FizzBuzz Series.
Specifications
The first argument is a path to a file.
Each line includes a test case.
Each test case is comprised of three spaced ...
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3answers
86 views
Recursive function that reverse the words in a string
I have been working on a problem that asks me to a write recursive function that can reverse the words in a string. For example if the string is "cat is running", then the result should be "running is ...
3
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1answer
108 views
Finding the prime factors of a positive number
I have an assignment to write on the standard output the prime factors of a positive number displayed in ascending order and separated by '*'. My code works, but I need help reviewing it before I ...
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1answer
62 views
Longest lines using priority queue
Inspired by a comment on this question, I thought I'd exercise my C skills by implementing something like it using a priority queue.
The idea is to be able to invoke the program like this:
./...
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2answers
808 views
C the large print
This is the Longest lines challenge from CodeEval:
Challenge
Write a program which reads a file and outputs a specified number of lines, sorted on length in descending order.
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1answer
45 views
Bottom up (iterative) mergesort in C
I have this C implementation of the bottom-up (iterative) mergesort:
mergesort.h:
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1answer
41 views
Parsing and executing a simple shell script
I'm writing a simple shell and want to parse and execute a simple shell script.
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3answers
2k views
Implementing atoi() in C
I was given a school assignment to implement atoi(). Please review my code.
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4answers
906 views
No more filthy words
Challenge
Given a list of words mixed with extra symbols. Write a program that will clean up the words from extra numbers and symbols.
Specifications
The first argument is a path to a file.
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5answers
124 views
11
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2answers
1k views
3
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0answers
72 views
CUDA program that emulates a kind of cellular automata slower on the GPU than on the CPU
I'm a very new to CUDA, so I'm still trying to understand how to make the best use of the GPU. I've ported a C algorithm to it. This algorithm works by loading the memory with an initial input, then ...
