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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1answer
27 views
Helper utilities for easier benchmarking in C
I have this tiny library for measuring the execution time in milliseconds and returning the duration plus the result:
execres.h
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0answers
15 views
What's wrong with this binary tree code? [on hold]
Apparently my professor gave me bad code, right before the exams.
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-5
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0answers
39 views
This code satisfies 74.0% of test case. help rectify the code [on hold]
Input and Output Format:
Input consists of 5 integers that correspond to r1, r2, r3, r4 and x.
Output consists of 2 integers. The 1st integer corresponds to the minimal amount she would spend for ...
3
votes
3answers
558 views
C Socket Part-1
In my ongoing attempts to become a better blog writer I have some written some more code that needs reviewing.
Full Source: https://github.com/Loki-Astari/Examples/tree/master/Version1
First Article: ...
5
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2answers
87 views
Longest palindrome in an array
I am new to programming, and think this code could be improved upon. Any suggestions?
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1answer
29 views
More error-checking
The purpose of this code is to check for errors in my code for a custom shell.
In a previous answer, they say that my code didn't have error-checking.
You need to check the result of every ...
8
votes
2answers
61 views
Hash table OOP implementation in C
To brush up my C I decided to do some OOP programming in C. I have never tested this before, but I was curious to try it since seeing an example of it a while ago. I decided to implement a simple hash ...
1
vote
1answer
32 views
Unit test with check testing framework
I have some code where the purpose is the decide if a char is between quotes in an expression. For example, awk '{print $1}' has a ...
11
votes
1answer
77 views
Arduino Snakes and Ladders
Here is a snakes and ladders game I made using an Arduino using a serial terminal, a set of addressable LED's to create a physical game board, a 7 segment display, and a piezoelectric to create sound.
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1
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0answers
24 views
MPI BMP image comparison
I made a simple program in which I compare two images pixel by pixel and determine if the pictures are the same. I'm trying to adapt it to MPI, but I'm afraid that the communications are taking too ...
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votes
0answers
20 views
RPN Stack for Real numbers [closed]
Mi problem that I need a scanf(%s) of a 'char', but I don't know where, or how, I have to put it to still work The RPN calculator.
Please HELP!!!!!!!!
My code takes operands and operators from the ...
-5
votes
0answers
27 views
Tic Tac Toe board [closed]
Hey guys I've been trying to use this function to scan in a tic tac toe board but I get a "too few arguments for format" error message, here's my code :
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3
votes
2answers
47 views
Extracting the longest line from standard input
I'm reading the K&R book and I'm interested in a program which finds the longest line on the input. I've written the same code as in the book, but I wanted to do it myself. I tried to write my own ...
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0answers
19 views
Josephus problem in C using linked list [closed]
// why is temp2 not getting updated? It points to a[0].
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-3
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0answers
15 views
How can I change my code using SIMD/AVX to calculate ranks in my page rank algorithm? [closed]
I am writing a page rank program. I am writing a method for updating the rankings. I have successful got it working with nested for loops and also a threaded version. However I would like to instead ...
12
votes
1answer
67 views
5
votes
2answers
75 views
Thread synchronization with mutex
This program prints odd numbers by thread1 and even numbers by thread2 sequentially. Can this code be optimized or made more ...
6
votes
2answers
84 views
Fast CSV parser
I have written a CSV parser to read in 12609000 lines of CSV data. Each line has 16 fields of both string and double type data. The following code takes about 40 seconds to parse the data. I would ...
1
vote
0answers
36 views
Cuda C Matrix Compression
I am using Cuda to learn and implement a CSR matrix compression algorithm. What can I do better relating to C's best practices?
main.c:
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0
votes
0answers
41 views
Building a Stack with C structs
After reading the book from which this example is from I started using APIs like this
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3
votes
2answers
56 views
Exercise 1-22 from K and R: line folding
I'm currently learning C with K&R, i'm right now in the exercise 1-22, but it's a little... hard to understand (at least for me). It says:
Write a program to "fold" long input lines into two ...
4
votes
3answers
79 views
Merging 3 sorted linked lists
I already know how to merge two linked list, but I needed to code a function that'll merge three already sorted linked lists into one.
I wrote a code and it is working fine, it takes care of null ...
2
votes
1answer
89 views
POSIX arithmetic expansion
I understand that a shell should be able to perform arithmetic expansion. My shell can do it:
$ echo $((1+2*3+4*5))
27
My solution uses the lemon parser where I ...
3
votes
1answer
44 views
Two variants of a picture database initialization routine
I wonder which of the two snippets is better? In the second one, I extracted two short subroutines.
On the one hand, extraction clearly separate the two tasks
On the other hand, it induces 6 more ...
4
votes
1answer
55 views
Allocating a contiguous block of memory for an array
I try to work with a contiguous block of memory, to create an array (2D) whose SIZE is not known at compile time (before c99) so no variable-length arrays are involved here.
I came up with the ...
0
votes
2answers
41 views
Two variants of a db_create_ressources(…) function
After reading noobs, I'm interested in possible way to improve readability of the following short snippet.
a struct pictdb_file is a small file system containing ...
7
votes
4answers
355 views
Custom user input function
The program consists of 3 files: demo.c, mylib.c and mylib.h. The code is heavily commented.
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0
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0answers
22 views
Recursive spinlock for C using ASM
My history of C/ASM locks here in codereview:
Simple spinlock for C using ASM
Simple spinlock for C using ASM, revision #1 (basis for this approach. If this one fails, then so will the one below.)
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3
votes
0answers
40 views
Time Limit Exceeded with shortest path algorithm
The problem:
SHPATH
You are given a list of cities. Each direct connection between two
cities has its transportation cost (an integer bigger than 0). The
goal is to find the paths of ...
2
votes
1answer
30 views
Simple pool of threads which calculate the sum of a given number from the main process
I have to make a program which creates a number of threads that are waiting at the beginning, then the main process creates a doubly linked list where random numbers are put and then a signal tells ...
3
votes
1answer
50 views
Testing different implementations of malloc()
Can you help me verify my test result? I'm testing different malloc() implementations with a small program that allocates gigabytes many times:
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3
votes
3answers
89 views
Counting the number of primes in C and C++11
I found this old piece of code that I wrote while I was learning C a while back:
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2
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0answers
36 views
Simple spinlock for C using ASM, revision #1
Revision #1 for Simple spinlock for C using ASM
The code:
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4
votes
1answer
56 views
Simple spinlock for C using ASM
This is my second attempt to make simple lock using extended assembly.
See http://stackoverflow.com/questions/37241553/locks-around-memory-manipulation-via-inline-assembly/37246263
The code:
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1
vote
1answer
56 views
1
vote
0answers
28 views
Convert tri-gram of type wchar_t to an integer type
I am trying to convert a tri-gram containing 3 characters of type wchar_t to an integer type (an uint64_t at the present time).
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1
vote
1answer
83 views
Reading from text files in C/C++ [closed]
I'm writing a program that has to check which are the two largest three digit numbers that are missing from a text file. I'm writing this in C++ and I'm trying to solve the mystery in a ...
3
votes
3answers
34 views
Array-based queue implementation using C
I wrote this header for generic use of a queue. The one thing I'm wondering is if I understood the usage of void*. I hope that if somebody teach me some conventions ...
3
votes
2answers
50 views
C - Improving (really) big number addition
I was lucky enough to stumble into this task during a job interview. I was gently guided to use string reversals and a few other things to speed up my process. I kept thinking that I wouldn't have ...
3
votes
1answer
61 views
Running shell commands in a pipeline
I'm writing a shell in C for Linux and BSD. My code was unreadable before but I did a rewrite and now it is much more readable. The purpose of the code is to create a command pipeline and execute it.
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4
votes
1answer
41 views
Secure file system utility functions
For Khronos, I've had to develop these utility functions to help me deal with storing the .wav files. However, they could also be used in a variety of ...
4
votes
2answers
73 views
Recreating strstr in C
I'm trying to recreate strstr in c, my code works but I think it is too long, and it needs some improvement.
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15
votes
2answers
350 views
The birth of my intelligent assistant: Khronos
I've done a lot of reworking to this main file recently, in regards to using a new speech recognition engine and integrating the last reviews suggestions. My question before is going to be phrased ...
2
votes
1answer
41 views
Median of 3 Quicksort in C
I'm trying to re-implement the C stdlib function qsort using a median of 3 quicksort.
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5
votes
3answers
102 views
Simple file renamer in C
It's been some time since I wrote something in C. I am looking for some advices related to my code in terms of coding style, bad/wrong logic, optimization (performance) and good practices.
The code ...
2
votes
1answer
51 views
Optimizations for bubble sort
The code performs bubble sort on the basis if any swaps has been performed in the iteration. I made it sort of independent of number of iterations as in any conventional bubble sorting code.
I went ...
3
votes
1answer
26 views
AES Wrap function
This code is supposed to implement RFC 3394 which also described in this PDF at page 11.
Are there any weak places or formatting issues in attached source? Or maybe some places are not explicit ...
4
votes
1answer
66 views
Small Poker program in C
I made a small Poker program with C but I believe I could've written it better.
Full source on bitbucket.org
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4
votes
1answer
41 views
Automake for an S/KEY implementation
I've been tasked with giving a legacy codebase some love. The actual code is written in C, but is not very relevant aside from the #includes each file makes. No, ...
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votes
2answers
48 views
Rewrite 12 consecutive ints based on bizarre logic
Despite looking terribly ugly, it is pretty interesting due to some specific connections to cellular automata theory. I'm looking for ways of simplifying it further. This program takes 2.7 seconds to ...
