🔌Your plug to a curated collection of useful C Programming tutorials, snippets, and projects that you can understand in 30 seconds or less.
P.S: This repository is a work in progress
- Use Ctrl + F or command + F to search for a snippet.
- Contributions welcome, please read the contribution guide.
Motivation for this project The core goal of 30 seconds of C is to provide a public record of my journey to learn c programming. It's my goal to provide a quality resource for both beginners and advanced c progammers/developers. My initial motivation for creating this repository was to use it as a tool to document my journey at the 42 Silicon Valley - an engineering and programming. The contents of this repo are designed to help you write real time C programs on your own.
Integer
Character
- char
- float
- Double
Purpose: This repo provides useful tips to understand how to achieve 100% at 42 Silicon Valley exams. A great developer like you 😎, however, should not just memorize the answers.
Create a program that takes a string, and displays the first 'a' character it encounters in it, followed by a newline. If there are no 'a' characters in the string, the program just writes a newline. If the number of parameters is not 1, the program displays 'a' followed by a newline.
$> ./aff_a "abc" | cat -e
a$
$> ./aff_a "dubO a POIL" | cat -e
a$
$> ./aff_a "zz sent le poney" | cat -e
$
$> ./aff_a | cat -e
a$Answer
#include <unistd.h>
int main(int argc, char **argv)
{
if (argc != 2)
write(1, "a", 1);
else
{
while (*argv[1])
if (*argv[1] == 'a')
{
write(1, "a", 1);
argv[1]++;
break;
}
}
write(1, "\n", 1);
return (0);
}Write a program that displays all digits in descending order, followed by a newline.
$> ./ft_countdown | cat -e
9876543210$
$>Answer
#include <unistd.h>
int main(void)
{
char c;
c = '9';
while (c >= '0')
{
write(1, &c, 1);
c--;
}
write(1, "\n", 1);
return (0);
}Write a function that displays all digits in ascending order.
Your function must be declared as follows:
void ft_print_numbers(void);
Answer
#include <unistd.h>
int main(void)
{
char c;
c = '0';
while (c <= '9')
{
write(1, &c,1);
c++;
}
write(1, "\n", 1);
return (0);
}If you are new to C Programming, try taking a look at some of these references.
- ANSI 89 – American National Standards Institute, American National Standard for Information Systems Programming Language C, 1989.
- Kernighan 78 – B. W. Kernighan and D. M. Ritchie, The C Programming Language, Prentice-Hall: Englewood Cliffs, NJ, 1978. Second edition, 1988.
- Thinking 90 – C* Programming Guide, Thinking Machines Corp. Cambridge Mass., 1990.
- Head First C - A complete learning experience for C and structured imperative programming.
- GeeksforGeeks - A computer science portal for geeks.
- SoloLearn - C Tutorial
- C Programming Google+ Community
- C Tutor - Visualize C code execution to learn C online
- Ideone - An nline compiler and debugging tool
- SoloLearn - Code Playground
The idea behind 30 Seconds of C was inspired some people who created similar collections in other programming languages and environments. Here are the ones we like the most:
- 30 Seconds of Code by charlarangelo
- 30 Seconds of CSS by atomiks
- 30 Seconds of Python by kriadmin
- 30 Seconds of Interviews by fejes713
Do you have a cool idea for a new snippet, or want to add your own tips? Checkout contributing.md.
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