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30 Seconds of C

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🔌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

Getting Started

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.

Table of Contents

📃Basic Data Types

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Integer

Character

Floating Point

➗Enumeration Data Type

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📚Derived Data Type

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🎛️Void Data Type

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Exam Shell

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.

aff_a

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 ```c #include 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); } ``` </details>
[⬆ Back to top](#table-of-contents) ### [ft_countdown](https://github.com/fredsiika/30-seconds-of-c/tree/master/examshell/00-ft_countdown)
Write a program that displays all digits in descending order, followed by a newline. ```c $> ./ft_countdown | cat -e 9876543210$ $> ```
Answer ```c #include int main(void) { char c; c = '9'; while (c >= '0') { write(1, &c, 1); c--; } write(1, "\n", 1); return (0); } ``` </details>
[⬆ Back to top](#table-of-contents) ### [ft_print_numbers](https://github.com/fredsiika/30-seconds-of-c/tree/master/examshell/00-ft_print_numbers)
Write a function that displays all digits in ascending order. Your function must be declared as follows: void ft_print_numbers(void);
Answer ```c #include int main(void) { char c; c = '0'; while (c <= '9') { write(1, &c,1); c++; } write(1, "\n", 1); return (0); } ``` </details>
[⬆ Back to top](#table-of-contents) ### Additional Learning Resources If you are new to C Programming, try taking a look at some of these references. #### Books --- - 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.](http://www.allitebooks.com/head-first-c/) #### Websites --- - [GeeksforGeeks - A computer science portal for geeks.](https://www.geeksforgeeks.org/c-programming-language/) - [SoloLearn - C Tutorial](https://www.sololearn.com/Course/C/) - [C Programming Google+ Community](https://plus.google.com/u/0/communities/103796658293092790651) #### Online Integrated Development Environments (IDEs) - [C Tutor - Visualize C code execution to learn C online](http://www.pythontutor.com/c.html#mode=edit) - [Ideone - An nline compiler and debugging tool](https://ideone.com/) - [SoloLearn - Code Playground](https://code.sololearn.com/#c) ## Inspiration for this project 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](https://github.com/Chalarangelo/30-seconds-of-code) by **charlarangelo** - [30 Seconds of CSS](https://atomiks.github.io/30-seconds-of-css) by **atomiks** - [30 Seconds of Python](https://github.com/kriadmin/30-seconds-of-python-code) by **kriadmin** - [30 Seconds of Interviews](https://30secondsofinterviews.org) by **fejes713** ## How to Contribute Do you have a cool idea for a new snippet, or want to add your own tips? Checkout [contributing.md](/30-seconds-of-c/CONTRIBUTING.md). ## Collaborators [](https://github.com/fredsiika)
[Fred Siika](https://github.com/fredsiika)
[](https://github.com/gracenellore)
[Grace Nelore](https://github.com/gracenellore) ## Credits *Icon made by [Smashicons](https://www.flaticon.com/authors/smashicons) from [www.flaticon.com](https://www.flaticon.com/) is licensed by [CC 3.0 BY](http://creativecommons.org/licenses/by/3.0/).*
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