C Programming for the Complete Newbie

C programming for the complete newbie

Hello there im Krisis you may have seen me on irc.hackersclub.com.

Well I thought it was about time to write an article like everyone else. But

unlike many others

mine wont be on Hacking, Cracking, or Phreaking it\'s on C programming, you

see I\'m not the best

hacker but I\'m an ok programmer. So here it goes. This is based for absolute

beginners so those

of you like my friend Chrak wouldn\'t be interested in it.

1st lets talk about some of C \'s history. C was invent by Dennis Ritchie

and Kenneth

Thompson. They modeled it after the language they were using called B. C

was a subset of B hence

the name. C was made because B was going out of style and they needed a new

language to write

UNIX in. Yes UNIX was made in C. C was made popular very quickly because

every UNIX sold had a C

compiler. A compiler is a program thats looks at your source code and

transfers it into object

code, after it is transferred

into object code it must be linked, once it\'s

linked it can be

executed.

/***************************************************************************

********************/

2nd Lets talk about variables they are your integers and characters and so

on. You have

many data types they are.

int integers

char characters

long int bigger integers

short int same as int

float decimal numbers

double even bigger decimal numbers

To define a variable 1st you must put something like int MyNum;

MyNum = 2;

or for a character value it would be like char name; name

= \'Jim\';

notice the \'\' you must have those around character values, they are not

needed for integers or

decimals.

/***************************************************************************

********************/

3rd I\'ll tell you about stuff like #include and #define. #include is used

to tell the

compiler that whatever is in the brackets just be included like its part of

your code.

#include <stdio.h>

#define is used to define something Like the color of a truck or car.

#define TRUCK \"red\"

#include and #define must come before any functions are even prototyped

(I\'ll talk about this

later).

/***************************************************************************

********************/

4th I\'ll talk about functions. Every program must have at least one

function. That

functions name must be main(). The () tells the compiler that it is a

function. All functions

must return a value in the main() function a 0 is usually returned. In your

functions you will

want to use comment\'s to explain your code a comment is begun by using /*

and ended by using */ .

I will now show you your 1st program.

#include <stdio.h> /* Used in most standard Input Output Programs */

main()

{ /* Beginning Brackets used to show the beginning

of

a block of code */

printf(\"Hello World\"); /* A function already written in Stdio.h */

return 0; /* Value returned from the program */

} /* Ending bracket used to show end of a block of code */

now compile your program in your compiler if your using UNIX do it like this

gcc hello.c -o Hello

and then run your program bye typing in ./Hello

/***************************************************************************

********************/

5th I\'ll talk about output which is essential