Re: how does this for loop work! - C / C++ / MFC Discussion Boards

Re: how to read and write a file use unicode in windows 98??

ebinaini25-Jan-06 14:31

ebinaini

25-Jan-06 14:31

i can't get the handle of file and i install MLU in windows 98

thanks in advance!

nothing

Re: how to read and write a file use unicode in windows 98??

David Crow26-Jan-06 2:27

David Crow

26-Jan-06 2:27

ebinaini wrote:
i can't get the handle of file...

Why not? What does the code snippet look like that does not work?

"The words of God are not like the oak leaf which dies and falls to the earth, but like the pine tree which stays green forever." - Native American Proverb

how does this for loop work!

namaskaaram24-Jan-06 23:21

namaskaaram

24-Jan-06 23:21

can anyone expain this logic flow!i mean the for loop makes no sense to me!...yet it works!and displays the map of india!

#include <stdio.h>
main()
{
int a,b,c;
int count = 1;
for (b=c=10;a="- FIGURE?, UMKC,XYZHello Folks,\
TFy!QJu ROo TNn(ROo)SLq SLq ULo+\
UHs UJq TNn*RPn/QPbEWS_JSWQAIJO^\
NBELPeHBFHT}TnALVlBLOFAkHFOuFETp\
HCStHAUFAgcEAelclcn^r^r\\tZvYxXy\
T|S~Pn SPm SOn TNn ULo0ULo#ULo-W\
Hq!WFs XDt!" [b+++21]; )

for(; a-- > 64 ; )
putchar ( ++c=='Z' ? c = c/ 9:33^b&1); return 0;
}

-- modified at 5:22 Wednesday 25th January, 2006

Re: how does this for loop work!

benjymous24-Jan-06 23:31

benjymous

24-Jan-06 23:31

Magic pixies Wink | ;-)

Seriously, obfuscated code is specifically designed to be utterly incomprehensible.

See http://www.ioccc.org/[^] for more

--
Help me! I'm turning into a grapefruit!
Buzzwords!

Re: how does this for loop work!

Trollslayer25-Jan-06 1:42

Trollslayer

25-Jan-06 1:42

Not magic mice?

The tigress is here Big Grin | :-D

Re: how does this for loop work!

Owner drawn24-Jan-06 23:32

Owner drawn

24-Jan-06 23:32

Gosh...

Jesus Loves Rose | [Rose]

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

Re: how does this for loop work!

Rage24-Jan-06 23:43

Rage

24-Jan-06 23:43

First shot:

namaskaaram wrote:
a="- FIGURE?, UMKC,XYZHello Folks,\
TFy!QJu ROo TNn(ROo)SLq SLq ULo+\
UHs UJq TNn*RPn/QPbEWS_JSWQAIJO^\
NBELPeHBFHT}TnALVlBLOFAkHFOuFETp\
HCStHAUFAgcEAelclcn^r^r\\tZvYxXy\
T|S~Pn SPm SOn TNn ULo0ULo#ULo-W\
Hq!WFs XDt!"

This is the map of india, XORed with some easy key.

namaskaaram wrote:
for(; a-- > 64 ; )
putchar ( ++c=='Z' ? c = c/ 9:33^b&1); return 0;

This displays spaces or '!', ++c=='Z' ? c = c/ 9:33^b&1 being the decyphering code.

More in a while...

~RaGE();

Re: how does this for loop work!

toxcct25-Jan-06 0:09

toxcct

25-Jan-06 0:09

Rage wrote:
This displays spaces or '!', ++c=='Z' ? c = c/ 9:33^b&1 being the decyphering code.

we have a ?: operator here, so might be seen this way first :

putchar(
    (++c == 'Z') ?
    (c = c / 9)  :
    (33 ^ (b & 1))    // bitwise & AND operator preceedes bitwise ^ XOR operator 
);

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: how does this for loop work!

Rage25-Jan-06 0:03

Rage

25-Jan-06 0:03

More as promised:

namaskaaram wrote:
a="- FIGURE?, UMKC,XYZHello Folks,\
TFy!QJu ROo TNn(ROo)SLq SLq ULo+\
UHs UJq TNn*RPn/QPbEWS_JSWQAIJO^\
NBELPeHBFHT}TnALVlBLOFAkHFOuFETp\
HCStHAUFAgcEAelclcn^r^r\\tZvYxXy\
T|S~Pn SPm SOn TNn ULo0ULo#ULo-W\
Hq!WFs XDt!" [b+++21];

for each step in this for loop:

1. b is increased by one in [b+++21], so you basically do b=10, b=11, b=12, and so on.

2. a is initialised to the value of the char placed in position b+21 as stated in [b+++21] in the map string.

3. the second for loop is executed. Let's have a closer look:

++c=='Z' ? c = c/ 9:33^b&1

this is equivalent to

if (c==30)
 putchar(c=c/9); // carriage return (next line to display)
else
 putchar(33^b&1);// displays space or !
c++;

following happens in the for loop

3a. a is decreased by one, meaning you stay in this loop (a-64) times
3b. c is increased. If c is equal to 'Z'(=30), a return to carriage is printed, since ++c=='Z' ? c = c/ 9:33^b&1 returns c = c/9, and this is 10.
3c. otherwise, you return 33 Xored with b&1 which is either a space or a '!' char, which prints the map.

when the index b+21 exceeds the string length, the assignement a = string[b+21]is false, leaving the first for loop.

and finally, int count = 1; is of no use Smile | :)

Hope this helps.

~RaGE();

-- modified at 6:03 Wednesday 25th January, 2006

Re: how does this for loop work!

David Crow25-Jan-06 4:12

David Crow

25-Jan-06 4:12

Rage wrote:
if (c==30)

Is actually:

if (c == 90)

thus dividing by 9 would yield 10, a newline character;

"The words of God are not like the oak leaf which dies and falls to the earth, but like the pine tree which stays green forever." - Native American Proverb

What it actually means... !

toxcct25-Jan-06 0:43

toxcct

25-Jan-06 0:43

this is how we could see it in a better view :

<font color=blue>#include</font> <stdio.h>
 
<font color=blue>int main</font>(<font color=blue>void</font>) {
    <font color=blue>int</font> a = 0,
        b = 10,
        c = 10; <font color=green>//count variable is not of any use</font>
 
    <font color=blue>char</font>* pszMap =
        <font color=gray>"- FIGURE?, UMKC,XYZHello Folks,"
        "TFy!QJu ROo TNn(ROo)SLq SLq ULo+"
        "UHs UJq TNn*RPn/QPbEWS_JSWQAIJO^"
        "NBELPeHBFHT}TnALVlBLOFAkHFOuFETp"
        "HCStHAUFAgcEAelclcn^r^r\\tZvYxXy"
        "T|S~Pn SPm SOn TNn ULo0ULo#ULo-W"
        "Hq!WFs XDt!"</font>;
 
    a = pszMap[b+21];
    b++;
    <font color=blue>while</font> (a != <font color=gray>'\0'</font>) {
        <font color=blue>while</font> (a > 64) {
            a--;
            c++;
            <font color=blue>if</font> (c == 'Z') {
                c /= 9;
                putchar(c);
            }
            <font color=blue>else</font> {
                putchar(33 ^ (b & 1));
            }
        }
        a = pszMap[b+21];
        b++;
    }
    <font color=blue>return</font> 0;
}

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: What it actually means... !

Eytukan25-Jan-06 2:32

Eytukan

25-Jan-06 2:32

well done buddy!!

VuNic

Re: What it actually means... !

toxcct25-Jan-06 2:34

toxcct

25-Jan-06 2:34

i love that sort of tests Wink | ;)

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: What it actually means... !

C^hris L^osinger25-Jan-06 4:50

C^hris L^osinger

25-Jan-06 4:50

toxcct wrote:
i love that sort of tests

me too

#include "stdio.h"
main()
{
    int b=0,c=0,q=60,_=q;for(float i=-20,o,O=0,l=0,j,p;j=O*O,p=l*l,
    (!_--|(j+p>4)?fputc(b?q+(_/3):10,(i+=!b,p=j=O=l=0,c++,stdout)),
    _=q:l=2*O*l+i/20,O=j-p+o),b=c%q,c<2400;o=-2+b*.05);
}

...

Cleek | Image Toolkits | Thumbnail maker

Re: What it actually means... !

toxcct25-Jan-06 4:54

toxcct

25-Jan-06 4:54

Chris Losinger wrote:
for(float i=-20,o,

the last o variable is defined nowhere...

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

[Message Deleted]

C^hris L^osinger25-Jan-06 5:02

C^hris L^osinger

25-Jan-06 5:02

[Message Deleted]

Re: What it actually means... !

toxcct25-Jan-06 5:04

toxcct

25-Jan-06 5:04

does this work when you don't even define a variable, to assign it a value ?

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: What it actually means... !

C^hris L^osinger25-Jan-06 5:13

C^hris L^osinger

25-Jan-06 5:13

yes, it will work.

i forget how i worked that thing out, but i think the o gets initialized before its value is ever used for anything meaningful.

Cleek | Image Toolkits | Thumbnail maker

Re: What it actually means... !

toxcct25-Jan-06 6:12

toxcct

25-Jan-06 6:12

ahh , i did not look correctly...
in for(float i=-20,o,O=0,l=0,j,p;j=O*....., o is defined as a float, such as i, O, l, j, p...

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: What it actually means... !

toxcct25-Jan-06 6:46

toxcct

25-Jan-06 6:46

i don't have any compiler there, so tell me if i'm wrong :

<font color=blue>#include</font> <font color=gray>"stdio.h"</font>   <font color=green>//it should be <stdio.h>, but anyway...</font>
<font color=blue>void main</font>(<font color=blue>void</font>) {
    <font color=blue>int</font> b =  0,
        c =  0,
        q = 60,
        _ =  q;
    <font color=blue>float</font> i = -20,
          o =   0,
          O =   0,
          l =   0,
          j =   0,
          p =   0;
    <font color=blue>do</font> {
        j = O * O;
        p = l * l;
        <font color=blue>if</font> ((!_) | ((j+p) > 4)) {
            i += !b;
            p = j = O = l = 0;
            <font color=blue>if</font> (b != 0) {
                fputc((q + (_ / 3)), <font color=blue>stdout</font>);
            }
            <font color=blue>else</font> {
                fputc(10, <font color=blue>stdout</font>);
            }
            c++;
        }
        <font color=blue>else</font> {
            l = (2 * O * l) + (i / 20);
            O = j - p + o;
        }
        _--;
        b = c % q;
        o = -2 + b * 0.05;
    } <font color=blue>while</font> (c < 2400);
}

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: What it actually means... !

C^hris L^osinger25-Jan-06 7:02

C^hris L^osinger

25-Jan-06 7:02

doesn't give the same output as the original.

Cleek | Image Toolkits | Thumbnail maker

Re: What it actually means... !

toxcct25-Jan-06 7:04

toxcct

25-Jan-06 7:04

sh*t

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

Re: What it actually means... !

C^hris L^osinger25-Jan-06 7:09

C^hris L^osinger

25-Jan-06 7:09

heh.

here's the starting point: http://www.codeproject.com/cpp/mandelbrot_obfuscation.asp[^]

Cleek | Image Toolkits | Thumbnail maker

Re: What it actually means... !

sunit525-Jan-06 7:14

sunit5

25-Jan-06 7:14

even I tooooooooo

never say die

Re: What it actually means... !

BadKarma25-Jan-06 20:42

BadKarma

25-Jan-06 20:42

toxcct wrote:
i love that sort of tests

Well here is another one,
Writen in the wee hours of the morning Sleepy | :zzz:

??=define _i_ int
??=define _i (??/
_i_
??=include<stdio.h>
_i_ main ??/
_i ??/
__i, char* ??/
i_??/
??(??/
??))
??=define _endl_ ; 
??<char _s??/
??(9??/
??), _i__??/
??(4??/
??) _endl_
??=define _s_ _endl_ _s
??<_s_ ??/
??(0??/
??) = '??/
??=' _s_ ??/
??(1??/
??) = '??/
??(' _s_ ??/
??(2??/
??) = '??/
??/??/' _endl_
??=define _m_(m_) ? m_ :
??>_s_ ??/
??(3??/
??) = '??/
??)' _s_ ??/
??(4??/
??) = '??/
??'' _s_ ??/
??(5??/
??) = '??<' _endl_
??=define _START(s) for _i __i__ = s _endl_
??<_i_ e = (__i == 2) ? (((*i_??/
??(1??/
??)-0x30) < 0) ??/
??!??/
??! ((*i_??/
??(1??/
??)-0x30) > 9)) _m_(9) (*i_??/
??(1??/
??)-0x30): 9 _endl_
??=define _VALIDATE(v) __i__ < e _endl_ __i__++)
??<_s_ ??/
??(6??/
??) = '??/
??!' _s_ ??/
??(7??/
??) = '??/
??>' _s_ ??/
??(8??/
??) = '??-' _endl_ 
??>
??=define move_to(n) case n:
??<_START(0) _VALIDATE(0)
??=define skip ) _endl_ break _endl_
??<switch (__i__) 
??< move_to(0)
??=define to_mem sprintf (_i__,
??<to_mem "??/
???/?=" skip 
??> move_to(1) 
??=define _do_i_ "%d. "
??< to_mem "??/
???/?(" skip 
??>move_to(2) 
??< to_mem "??/
???/?/" skip
??> move_to(3)
??< to_mem "??/
???/?)" skip
??=define move_screen printf (
??=define show_single(i) , _s ??/
??(i??/
??)
??=define _char_ " %c"
??>move_to(4) 
??< to_mem "??/
???/?'" skip 
??> move_to(5) 
??< to_mem "??/
???/?<" skip
??=define _endl_null_ return 0 _endl_
??>move_to(6) 
??< to_mem "??/
???/?!" skip 
??> move_to(7) 
??< to_mem "??/
???/?>" skip 
??=define _text_ " %s means "
??>move_to(8) 
??< to_mem "??/
???/?-" skip ??> 
??>move_screen _do_i_ "_text_"_text_"_char_"_char_"??/
??/n", __i__, _i__ show_single (__i__)) _endl_ 
??> 
??> 
??> _endl_null_ 
??>

Have fun

codito ergo sum

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