232 lines
11 KiB
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232 lines
11 KiB
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ
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<20> C Programming Series: Issue 1 <20>
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<20> Released With DNA Volume 1, Issue 2 <20>
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<20> Written by Pazuzu 04-21-1993 <20>
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ
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Welcome to Issue #1 of Pazuzu's Guide to C Programming: The Fun, Easy, And
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Possibly DESTRUCTIVE Way to Learn C!
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You may wonder why I'm writing an article on a non-underground topic. In
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truth, it's really not any of your fucking business and you should just BUTT
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OUT, MIND YOUR OWN FUCKING BUSINESS, AND ENJOY THE INFO. But, since I'm in a
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good mood, I'll tell you anyway.
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I've been seeing posts all over the place, on nets, local BBS's, everywhere,
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with people saying "hOw Do YoU pRoGrAm In C?!^%$!$!$!!!?????". So, I decided
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to write a tutorial series so that even the stupidest fool who can't even use
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WINDOWS will be able to program in C, without damaging his hard drive (at
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least not physically anyway.). Actually, you can't be a total idiot, you DO
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have to get a C compiler, and figure out how to use it, because I'm not
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telling you how to use the compiler, only how to write programs. If you can't
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accomplish the simple task of getting a C compiler and figuring out how to
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use it (I recommend Turbo or Borland C, as some of my examples are
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TC/BC-specific), then please put your computer in a suitable shipping box and
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ship it to the PO box listed at the end of this article, then place a loaded
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gun to your head and pull the trigger.
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C programming is not particularly difficult, and I assume only a knowledge
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of either BASIC or Pascal in this series. C will save you much time when
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coding, just in typing alone. For example, in Pascal, to define a code block,
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you have to type "Begin" and "End". This is utterly ridiculous. In C, it is
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simply "{" and "}". Besides, Pascal was invented as a teaching language
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anyway, while C was made BY programmers FOR programmers, and we ALL know what
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BASIC is for, so WHY would you want to use anything but C?
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Variables, Declarations, Type Specifiers, Etc
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In BASIC, when you need a variable, you just use it. However, in most other
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languages, you must DECLARE each variable before it is used. You do this by
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telling the compiler the name of the variable and what type of data it needs
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to hold. Here are a few examples in C:
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int i;
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register int j;
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char a_string[9];
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unsigned char q;
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The first line declares an integer variable named "i", which can hold any
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value between -32,767 and +32,767 - the maximum values allowed in 16 bits.
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The second line is a special case - it tells the compiler to write code that
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will use a REGISTER for the variable, if one is available. You would do this
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for any variables that are used for loop control, as the CPU can access a
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register MUCH faster than a memory location, and any loop control variable is
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going to be accessed many times. If there is no register available, the
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compiler just makes it a normal variable - you don't need to worry about it.
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Line 3 is a very important example. There isn't a string data type in C - you
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must use arrays of char's. Line 3 defines an 8-character string. Why only 8?,
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you ask... Well, in C, every string must end in a NULL (ASCII 0), and that
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NULL takes up a position in memory, so you need to always make the strings
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one bigger than what you really need. The NULL is handled automagically by
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all of the library's string functions.
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Line 4 defines an 8-bit variable which can hold either an actual ASCII
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character or an integer value in the range 0 to 255 - the maximum for 8
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bits. If you define an unsigned int, you can hold a value between 0 and
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65,535. The reason for this is that C assumes you want a signed unless you
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say unsigned. The highest bit is always used for the sign, so with a signed
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int, you can have -32,767 to +32,767 (-128 thru +128 for signed char), and
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with an unsigned, you get 0 thru 65,535 for int, and 0 thru 255 for char.
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There's a few other type specifiers also, the most important being long. If
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you apply long to an int, you get 32 bits, which is a pretty huge range, even
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if it's signed. Unsigned, it's really huge. I don't remember the range off
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the top of my head, and I don't want to load the compiler and check in the
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help right now, so you'll just have to figure it out yourself. But trust me,
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it's big enough to handle any values you could ever possibly want.
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Very Basic C Programming
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~~~~~~~~~~~~~~~~~~~~~~~~
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With that out of the way, on to the structure of a C program...
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C is a weird language in that it defines NO, that's right - NO input/output
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commands... "Well then how the fuck do I do input/output???" you ask. You do
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it through FUNCTION CALLS. The C language has control structures, arithmetic
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operators, and logical test commands, but no i/o commands - that is the job
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of the library. Every C compiler comes with a library, and it's basically
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standardized - for example, printf will almost always be printf, but the
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compiler writer could have just as easily called it print_the_fucking_stuff
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if he really wanted to.
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A C program is made up of functions and function calls. The *MUST* be one
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function, called main() which is what gets called when you first execute the
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program... Here is an example of a very basic C program:
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#include <stdio.h>
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void main(void) {
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clrscr();
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printf("\n\nhElLo cReWeL, EViL, aNd WiCKED wOrLd!%$^!$!!^%$!^%$!!\n\n");
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}
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This illustrates several important things:
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Line 1 (the #include line): The #include command isn't a C command, it's a
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command to the compiler to include (I bet you would have never figured that
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out!!!) another file into the compilation. In this case, we are including the
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stANdARD iNPUT/oUTPUT library header file. We need to do this because without
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it, the compiler won't know what the fuck we're talking about when we use any
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i/o functions - they're defined in stdio.h ...
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Line 2: This declares the main() function. The first void tells the compiler
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that main() doesn't return any value to the caller (since there isn't one!),
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while the second void tells the compiler that main() doesn't require any
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parameters. The { opens the function block.
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Line 3: This is a call to the library's clear screen routine.
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Line 4: This prints a string. The "\n"'s are NEWLINES, they tell the function
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to go to the next line. You will also notice that all statement lines and in
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a ";"...
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Line 5 (}): This ends main()'s function block, and also in this case the
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program.
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This illustrates several important points, as well as carries on the
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traditional of ALWAYS making programming students write a "hello world"
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program as their first. Of course, I altered the text, because I'm scum, but
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ohwell.
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Here is another sample program:
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#include <stdio.h>
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void main(void) {
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register int i;
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char inpstr[81];
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for(i=0;i<100;i++) {
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clrscr();
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printf("\n\nInput a string: ");
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gets(inpstr);
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printf("\n\nYou typed: %s, number %i\n",inpstr,i);
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gets(inpstr);
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}
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}
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Ok, the first few lines should already be familiar for you. I'm going to
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start with the "for..." line. This illustrates an important thing in C - the
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for loop. Most other languages have this - in BASIC its FOR I = 1 TO 100. The
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C version is a bit harder to understand, yet infinitely more powerful. The
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first part ("i=0;") set the loop counter to 0. The second part ("i<100";)
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specifies what condition to test when deciding if the loop is done yet. In
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this case, as long as i is less than 100, the loop will execute. The last
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part ("i++") specifies the increment command. This command is what gets
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executed to increment the loop counter. In this case, i gets 1 added to it
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every time the loop executes. The "++" operator is VERY important: In other
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languages, you have to code i = i + 1 - in C, the i = i + 1 is valid -
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however, it will be less efficient when compiled. The reason for the is that
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the i=i+1 version compiles to an ADD instruction, while i++ would compile to
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a simple INC instruction. This is far more efficient. This is called "C
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SHORTHAND", and there are several others as well: i-- (subtract 1), i+=3
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(i=i+3), and so on. Of course, the variable doesn't have to be i, could be
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any other variable.
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Another VERY important concept is demonstrated by this for loop as well - the
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BLOCK STATEMENT. Any place a normal single statement is valid, a block
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statement enclosed by { and } is also valid. In this example, everything
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between the { and } will get executed on each iteration of the loop.
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clrscr() is the Borland library function to clear the screen - other
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compilers may vary.
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The first printf statement should be quite obvious.
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gets() is one of the Borland library functions to input a string from the
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keyboard. Quite simple.
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The next printf line shows off part of the true power of printf. The string
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between the quotes in any printf statement is really a FORMAT STRING, and in
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most cases, will just be output as is. However, if you insert any % commands,
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printf will expect additional arguments to tell it what to print in their
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place. The %s means put a string at this position, and %i means use an
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integer. For every % command, you must have a variable, separated by commas
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outside the closing quote, else you will crash your program. In this case,
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printf will print "You typed: " then whatever you typed into inpstr, then ",
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number " and the current value of i. This makes printf very powerful as
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I'm sure you can see.
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The last gets() line just makes you press enter to continue.
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I've covered quite a bit here, and you can actually do quite a bit with this
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small amount of knowledge, if you're creative enough. Next issue, I'll cover
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pointers, bit fields, structures, and basic file accessing.
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Call:
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ
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<EFBFBD> DnA Systems, Inc. - DnA World Headquarters & Order Processing Center <20>
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<EFBFBD> hack/phreak/anarchy/scams/virii+trojans/anti-gov't ONLY <20>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ
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<EFBFBD> 177 Issues of Computer Underground Digest (Vol. 1-5) <20>
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<EFBFBD> ALL Issues of Phrack <20>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ
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<EFBFBD> Legion of Doom * P/HUN * 40 Hex * Phalcon Virus Writing Guides <20>
|
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ
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<EFBFBD> 476 Viruses On-Line <20>
|
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ
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<EFBFBD> The Sixth Column Western US Distribution Center <20>
|
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ
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|||
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<EFBFBD> CyberCrime International Network 714 Area Coordinator (69:5714/0) <20>
|
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<EFBFBD> Platinum Net 714 Hub (93:7714/0) <20>
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<EFBFBD> BOCNet Node (14:313/7) <20>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ķ
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<EFBFBD> 714-646-9180 * 714-646-9180 * 714-646-9180 * 714-646-9180 <20>
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<EFBFBD> 714-646-9180 * 714-646-9180 * 714-646-9180 * 714-646-9180 <20>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ
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