Tagged Questions
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.
-3
votes
2answers
46 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' factors.. and so on....
1. Should I use a linked list for these types of ...
0
votes
0answers
19 views
Handling async in embedded C [on hold]
I am writing an embedded application for MCU (STM32), and I encounter this problem of async programming.
I would like to show you 2 cases, the first case is to use a blocking call, to send data
<...
8
votes
3answers
182 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'...
1
vote
0answers
21 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:
...
10
votes
8answers
1k 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
votes
1answer
32 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:
...
2
votes
1answer
32 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 ...
-2
votes
0answers
27 views
4
votes
1answer
59 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) ...
8
votes
2answers
34 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, ...
5
votes
1answer
85 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 ...
0
votes
2answers
60 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 ...
5
votes
3answers
494 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)
...
5
votes
2answers
312 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 (...
4
votes
2answers
87 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:
...
-1
votes
0answers
17 views
CS50 pset1 - hacker1 [closed]
I'm beginning my journey into computer science and I've started with the CS50 course.
The first problem set requires you to check if a number might be a valid credit card number by using Luhn’s ...
5
votes
3answers
109 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 <...
2
votes
1answer
42 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
votes
0answers
35 views
+50
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 ...
4
votes
2answers
62 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 ...
2
votes
2answers
29 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
...
1
vote
2answers
26 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
...
4
votes
1answer
106 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 ...
1
vote
3answers
83 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
votes
1answer
102 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 ...
7
votes
1answer
57 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:
./...
6
votes
2answers
774 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.
...
4
votes
1answer
43 views
Bottom up (iterative) mergesort in C
I have this C implementation of the bottom-up (iterative) mergesort:
mergesort.h:
...
1
vote
1answer
37 views
Parsing and executing a simple shell script
I'm writing a simple shell and want to parse and execute a simple shell script.
...
7
votes
3answers
2k views
Implementing atoi() in C
I was given a school assignment to implement atoi(). Please review my code.
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7
votes
4answers
902 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.
...
4
votes
5answers
124 views
10
votes
2answers
1k views
3
votes
0answers
71 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 ...
8
votes
2answers
77 views
Thread to send heartbeat UDP packets
This C code will run on an embedded machine with a Linux OS. It should create data packets (ASCII) to repeatedly be sent to a UDP server.
Just to give an overview about what functions should do:
<...
1
vote
1answer
53 views
Mergesort algorithm in C
I have this mergesort implementation that has exactly the same API as qsort:
mergesort.h:
...
3
votes
3answers
99 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
...
16
votes
1answer
192 views
Get Minimum of four and maximum up to a limit
Sita shortlists 4 gifts priced at r1, r2, r3 and r4
respectively. She wants to buy 3 of these gifts such that it doesn't
exceed her budget of x.
Input and Output Format:
Input consists ...
4
votes
4answers
618 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: ...
6
votes
2answers
114 views
Longest palindrome in an array
I am new to programming, and think this code could be improved upon. Any suggestions?
...
-1
votes
1answer
36 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
73 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
39 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 ...
15
votes
1answer
104 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.
...
2
votes
0answers
39 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 ...
1
vote
0answers
86 views
Unwrapping multiple inner loops in CUDA for 4D nonlocal filter
I'm working on some sort of non-local means filtering in 4D space (x,y,z + time). The idea is to pass to GPU a chunk of large 4D array in order to process it and return a filtered 3D slice (then ...
3
votes
2answers
52 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 ...
12
votes
1answer
75 views
5
votes
2answers
79 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
94 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 ...
