C Wars, Chapter One: The Segfault menace
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CodeLongAndPros (1536)

Hello, World! 🖖

To compete with @HahaYes C++ tutorial, I take the side of C, as defined in The C programming language, second edition by Brain Kerninghan and Dennsi Ritchie.

Edit: Chapter two is out

Now:

Let the games begin!

Chapter 1, part 1:

Hello World

The only real way to learn a language is to start programming in it.

So, we will do Hello world.

Code

Please make a new C repl, and enter this code into it.

(No Copy-Paste)

#include <stdio.h>

int main() 
{
    printf("Hello world\n");
    return 0;
}

Run

If you are in repl, press C-ret, or 'Run'

If you are on a *NIX system use this:

gcc hello.c -Wall -Werror -o main.o && chmod +x main.o && ./main.o

If you are on Windows, download 50G of IDE and C++/Python/NET compilers (VS) and make a new project and hope your computer won't crash.

Output

You should see this appear in your terminal:

$ gcc hello.c -Wall -Werror -o main.o && chmod +x main.o && ./main.o
$ ./main.o
Hello world
$ 

Chapter 1, part 2

Meta time

This section is very meta about C, and is not Strictly required.

Every C program has two parts:

  • Functions
  • Variables

Or, to be even more meta:

  • Code
  • Data

Let's dissect hello.c, line for line:

#include <stdio.h>

This may look like elvis elvish, but it is very simple.

The # char indicates a preprocesser directive.

The directive in question Prime include, includes other code in your program.

The prefix std means standard, and io means input/ouput

int main()

This is a function, or a snippet of code.

Every function has the form return_type name(args)

In this one, we have a return type of int, named main that takes no arguments

{

In C, a curly brace ({/}) seperates blocks of code.
In this case, all you need to know is that all code between { and } is part of main

printf("Hello world");

This is another function, like main.

It is named printf. In non-programmer speak, it means print with formatting. The formatting part is in Chapter two. It takes one -or two- arguments, the string to print, and the format string.

All lines that don't start with a # or are a function end with ;. No exceptions. Ever.

In this case, we are asking it to print Hello world with no formmatting.

return 0;

This is a special statment, return. It returns a piece of Data, like a gift.
For main, the return value is normally used to tell if the program failed, or worked.

  • 0: It worked
  • 1: General error
  • 2+: Random error

And, last but not least:

}

This tells your computer that your are done with main and want to move on.

Chapter 1, part 3

Your challenge

You need to make a program that prints out three things:

  • Your favorite Browser (Firefox)
  • The operating system you don't like the most (Windows 10)
  • Your favorite type of pet (Dog)

Please give them to me in the comments

Example output:

$ ./a.out
Firefox
Windows 10
Dog
$

Part One: The Segfault menace

Part Two: The data wars

Part Three: Revenge of the if

Part Four: A new loop

Part Five: The Empire points back

Part Six: Return of the function

You are viewing a single comment. View All
awesome10 (232)
#include <iostream>
int main() {
  std::cout << Chrome << std::endl;
  std::cout << Linux << std::endl;
  std::cout << Cat << std::endl;
  return 0;
}

its right, right?

CodeLongAndPros (1536)

@awesome10 Well, this is C.

Not C++.

Look at @HahaYes's for C++

awesome10 (232)

@CodeLongAndPros well then:

#include <stdio.h>
int main() {
  printf("I don't care");
  return 0;
}
CodeLongAndPros (1536)

@awesome10 The correct one is:

#include <stdio.h>

using namespace std;

import std.stdio: writeln;
int main() {
  writeln("Firefox");
  cout << "Windows 10\n"; 
  printf("%s\n", "Dog");
}
awesome10 (232)

@CodeLongAndPros

using namespace std;

is bad and i actually like cats

CodeLongAndPros (1536)

@awesome10 Well, HahaYes does it...

But I know.

awesome10 (232)

@CodeLongAndPros well, i never said i learned all my cpp from hahayes and i actually like both cpp and c and c# the same wait that isn't 2 things watever

awesome10 (232)

@HahaYes oh no you weren't supposed to be listening!

CodeLongAndPros (1536)

@awesome10 Don't worry, I do that to him all the time.

awesome10 (232)

@CodeLongAndPros i said i liked cpp, c, and c# the same

HahaYes (1287)

@awesome10 I have seen your comments traitor. JK XD

CodeLongAndPros (1536)

@awesome10
Haha,
Segmentation fault (core dumped)

awesome10 (232)

@CodeLongAndPros

Haha,
^~~~~~

Traceback (most recent call last):
    File <stdin>, line one, in <comment>
NameError: Haha, is not defined
awesome10 (232)

@CodeLongAndPros

Haha,
^~~~~~

Traceback (most recent call last):
    File <stdin>, line one, in <comment>
NameError: Haha, is not defined