Computer Club MNNIT

puzzle to puzzle you

amazon — Fri, 16 Jan 2009 16:47:25 GMT

a three digit lock has gone defective.....
if any two digit are correct you can be granted access
find the minimum no of trials that will make you get through the door

my guess is 10*10*10 !!!1

nested structure

amazon — Fri, 16 Jan 2009 16:45:20 GMT

struct a
{

struct b
{
int x;
int y;
int z;
}bb;

struct c
{
......
......
......
}cc;

struct d
{
int i;
int j;
int k;
}dd;
}aa;

now the prob is given address of dd.i get the address/value of x....
(and no sizeof plz......)

magic show

rohit.cse — Mon, 18 Aug 2008 07:48:03 GMT

In a magic show, magician performed the following trick. The magician left the room. The assistant handed over a standard deck of 52 cards to someone in the audience. The audience member chose any five cards from the deck and handed them to the assistant. The assistant then selected one of those cards which he concealed from the magician, and displayed the other four cards side-by-side on a table. The magician then entered the room, examined only the four displayed cards, and told ...

FAR POINTERS

amazon — Fri, 16 Jan 2009 16:37:41 GMT

was going through pointers in c ('second last chapter')....
there he has given method to access a perticular memory area and read or write it...

he has used far,near pointers..
plz ... explain it seemed all bizzare..

opening applications eg. pdf for document viewing ,audio playing etc

amazon — Fri, 16 Jan 2009 16:34:01 GMT

php pe script plz..

allow upload and download of files!!!!

amazon — Fri, 16 Jan 2009 16:33:01 GMT

don't just view it...reply to it

sending email to a perticular user

amazon — Fri, 16 Jan 2009 16:31:24 GMT

how to send mail to the user (generally when forget the password) and also sending random passwords and account verification

1.how to include video in the website???

amazon — Fri, 16 Jan 2009 16:24:44 GMT

yaar just paste the whole source code you know will be of immense help

i am raising few basic questions about websites...
new new methods are welcome

compile this !!!!

amazon — Thu, 08 Jan 2009 13:16:25 GMT

test0.c #include main() { fun(2.3); } test1.c #include void fun(float a) { printf(" yes it did"); } compile this : $gcc test[0-1].c now replace test1.c #include void fun(float a) { printf(" yes it did %f ",a); } again compile ??????????

what is th address in union

amazon — Thu, 08 Jan 2009 13:18:35 GMT

#include
using namespace std;
union add
{ int a;
float f;
char next;
};
main()
{ add ad;
cout<<&ad.a<<'\t'<<&ad.f<<'\t'<<&ad.next;
}

?????

A DOUBT REGARDING COMPILERS

goldberg — Mon, 17 Nov 2008 14:33:15 GMT

I observed that when I allocate some memory dynamically
If I use gcc compiler the values are initialised to 0 for integers , NULL for pointers and so on
But this is not the case when I use DEV C
Can sum1 plz explain me why is this so
And also If there are some other differences between gcc and DEV C can someone plz list them.....

Execute fuction not called directly or indirectly by main

arahan — Wed, 15 Oct 2008 14:04:23 GMT

Help me in writing a simple c library My friend is learning C and require the Hello World program so I wrote a hello world program but instead of writing #include int main() { printf("hello world"); } I wrote #include int main() { } Now i have sent it to my friend and I don't want that he found the error so I convince him that it require a library to compile and print correctly . Help me writing my library

Asynchronous multichat server

Ramprasadg — Wed, 15 Oct 2008 02:43:54 GMT

in our CN pracs sir is asking us to make an Asynchronous multichat server.what does he mean by this? (how is it different?).
what are the things to be used ?(i heard something like signal handling etc...)
please give a link of tutorial or something on the net that can help others.

Lets get started again!!!

shivang — Wed, 27 Aug 2008 13:13:47 GMT

Given a 2-dimensional array of positive and negative integers, find the sub-rectangle with the largest sum. The sum of a rectangle is the sum of all the elements in that rectangle. In this problem the sub-rectangle with the largest sum is referred to as the maximal sub-rectangle. A sub-rectangle is any contiguous sub-array of size 1 x 1 or greater located within the whole array. As an example, the maximal sub-rectangle of the array: matrix2 0......2.....-7....0 9......2......-6....2 -4.....1......-4....1 -1.....8...... ...

local mirror

Ramprasadg — Thu, 23 Oct 2008 10:32:03 GMT

i have most common updates foir ubuntu hardy heron,i would like to share it with others
i am currently using aptoncd to make a DVD iso and sharing it on dc++.
but for others have to download it ,then run it.
is there a way by which s a can locally mirror so that others can use just apt-get to download packages from me.

A main program without main :)

Invincible — Thu, 21 Aug 2008 14:13:48 GMT

Here goes the challenge to all..........

Write a C program without the function main()...........

RandonInt()

SwitchCase — Thu, 18 Sep 2008 06:58:16 GMT

A nested function call is when inside a function, you call the same function.\ We will now define a function RandomInt(N). This function generates a random number between 0 and N-1 (inclusive) with equal probability. Now RandomInt(Random(Random(..........RandomInt(N).....)))) is nested. RandomInt(N) means nesting of 1. And RandomInt(RandomInt(N)) means nesting of 2 and thus so on.... You will be given a Number N, nesting (the no of nestings) and Target. You have to give the ...

Probability....!!

SwitchCase — Thu, 18 Sep 2008 06:52:55 GMT

You are given a value n. This represents nXn Chess Board. Im sure you all know how a knight moves on a chess board. You will be given a starting position for the knight (x,y) With 1,1 being the bottom left corner. Now, a knight can jump over other pieces and can thus make J number of jumps. Given n, x,y, J Find the probability that after J jumps the knight is still on the Board. (The knight is said to be outside a board, if a jump causes it to move out of the nXn ...

write your own shell

Admin — Tue, 23 Sep 2008 19:56:30 GMT

you must have work on bash ksh ,sh shells on linux now it's time for to write your own shell are you ready ?? You are required to write a C program which accepts a UNIX/Linux shell command as an input and deliver output of that command on the same x-terminal. Your program must support the following: 1. The internal command �exit �which terminates the shell. 2. A command with no arguments (Example: ls) 3. A command with arguments (Example: ls -l) 4. A command, with or without ...

SWAPPING (HARD)

SwitchCase — Wed, 13 Aug 2008 16:01:50 GMT

NOW Ur task is still the same..

Except....
U r allowed only 3 statements..
And only one operator.

(PS: DONT BE SMART AND USE -(-b) as the same thing!!!!)

swap without using temp variable

gunendu — Wed, 24 Sep 2008 17:29:27 GMT

another solution may be..

a=a*b;
b=a/b; (b!=0)
a=a/b;

@DEBUGGING-GREATEST OF TWO INTEGERS

prani — Tue, 09 Sep 2008 20:07:40 GMT

This question was asked in debugging elims...
Find the greatest of two integers without using relational operators..

Redirect output as argument for other command(plz help)

goldberg — Tue, 16 Sep 2008 10:52:26 GMT

How do we redirect output of one command as argument to another command Actually i m searching for answer of question of tux wars : Suppose the root user wants to go into the home directory of user named "cs054011" what command will he execute at his shell. Assume he doesn't know the exact pathname of directory. Now if I use the command find . -name "cs054011" -print I will get the path of the user but how to redirect it as argument to cd

could this happen.. ??

vijay — Mon, 18 Aug 2008 13:19:25 GMT

consider this output... Code: $ ./prog IITK IITD IITM $ and now this.... Code: $./prog | wc -l IITK IITD IITM 0 $ in the second case... the output was expected to be .. Code: $./prog | wc -l 3 $ what is happening here...?? modify this shell sequence so that expected output is printed....

Sum of all Permutations

prani — Tue, 16 Sep 2008 17:18:25 GMT

you are given a number n you are to give the sum of all possible unique permutations Example 0) 157 Returns: 2886 We have: 157 + 175 + 517 + 571 + 715 + 751 = 2886 1) 313 Returns: 777 We have: 133 + 313 + 331 = 777 2) 1234 Returns: 66660 3) 5 Returns: 5 4) 54321 Returns: 3999960 5) 99999 Returns: 99999 problem source SRM 252 topcoder

kuch netwrking k bhi tricks btaooo

Gyanendra — Tue, 16 Sep 2008 05:05:47 GMT

plzz post the netcat utliites and netwrking related utilies !!

Rotate an array and a linked list

Admin — Sun, 03 Aug 2008 12:03:48 GMT

Suppose we have an array A having n elements. You have to rotate the array by k positions.
For e.g. if we have the array A={1,2,3,4,5} and k=2 then the resulting array should be {3,4,5,1,2}. Try to post an in-place solution. The array need not be sorted originally. The question has multiple solutions. Try to discuss all.

Now what will be the approach if you want to rotate a singly linked list instead of an array.

Reverse a list

Pulkit — Tue, 12 Aug 2008 17:08:23 GMT

write a code to reverse a singly linked list....

If done with this try it for a Doubly linked list.

count total trees

Admin — Sat, 30 Aug 2008 17:00:39 GMT

Write a program to count the total no. of binary trees possible with n nodes.
Try to optimise the solution.

shell command

Admin — Sun, 17 Aug 2008 17:32:15 GMT

Just write a single shell command without any pipes to list all those files
in the current directory whose filenames are just two characters long.?

puzzle.pls do it

vivek.nuna — Fri, 15 Aug 2008 05:44:52 GMT

u hav given n numbers.......
arrange n numbers in a line...........
find the probability such that no arrangement hav 2 consecutinve number in pair(smaller one first then the bigger number)?

Stanley's Matrix of zeroes

Akash Kumar — Wed, 10 Sep 2008 14:58:11 GMT

Richard Stanley is a combinatorial Mathematician at MIT. You can blame him for many of the tough interview puzzles you might have herad of. he also framed this puzzle.

You have to figure out the number of ways in which you can fill a N*N matrix such that every row and every column have odd number of zeroes.

Plzz add few more problems!!

Gyanendra — Wed, 10 Sep 2008 02:41:47 GMT

There shud be some problems related to SYSTEM ADMINISTRATION ..and disk format issuses !!plzz post accordingly !!!

your own printf

Admin — Sat, 06 Sep 2008 05:05:29 GMT

How can I arrange to have output go two places at once,
e.g. to the screen and to a file?write your own printf function to do this?

HELP!!! :(

Gyanendra — Mon, 08 Sep 2008 04:14:43 GMT

Can nebdy demonstarte editing of rc03.d scripts and other rc startup scripts !!wats the fundah of K nd S at the starting of the services !!

stdout vs stderr in fprintf

shivang — Sat, 30 Aug 2008 19:42:33 GMT

The following program doesn't "seem" to print "hello-out". (Try executing it) #include #include int main() { while(1) { fprintf(stdout,"hello-out"); fprintf(stderr,"hello-err"); sleep(1); } return 0; } What could be the reason? I don't know the answer.

Creating a file

Admin — Sun, 10 Aug 2008 15:09:32 GMT

Make a file whose name starts with a '-' sign for e.g. -z and open it with vi editor. In that write a C code that prints the file name.

How to search for particular file?

Ramprasadg — Mon, 18 Aug 2008 13:50:00 GMT

How to search for particular file that contains a few keywords?(remember i am not talking about file names)
in windows search there is this option that can search the content ,how to do it in Linux

help needed with this question

gumber — Sun, 07 Sep 2008 09:10:42 GMT

Code:: int main() { printf("%u %u",sizeof(main),sizeof(main())); return 0; }

can somebody plz explain me the output of this program

write a command

Admin — Sat, 06 Sep 2008 05:03:56 GMT

How can I arrange to have output go two places at once,
e.g. to the screen and to a file? give a command for this?

ip address conflict

Admin — Mon, 01 Sep 2008 13:00:56 GMT

if you change your IP settings sometimes your Windows shows that there is a
ip-conflict.. in other words it identifies that there is some other node in your subnet
which already is using the same address.How does your windows know that ?

fflush(stdin) in LINUX

goldberg — Sat, 30 Aug 2008 14:12:18 GMT

Suppose you type the following program in Linux and then Compile it using a gcc compiler int n; char str[80]; printf("enter a number: "); scanf("%d", &n); printf("enter a string: "); gets(str); printf("you typed %d and \"%s\"\n", n, str); but the compiler seems to be skipping the call to gets()! This is just an example There are other cases too.. Most of the people might be knowing why it happens This ...

a simple one....try this...

vijay — Mon, 18 Aug 2008 14:00:31 GMT

consider this code....

Code:: main() { char *p = "1111" ; printf("%d\n",*(int *)p) ; }

now given that ASCII value of '1' is p.... what does this output... answer in terms of p....
try this without actually running the code....

lets see who remember last sem's CT's and end sem

ankurgutpa — Tue, 12 Aug 2008 17:54:43 GMT

write a script to add 50 users to ur machine without useradd command.
now delete these 50 users and thier all stuff without using userdel command

Floating navigational menu..

Invincible — Thu, 21 Aug 2008 14:10:23 GMT

Floating menu is the one which slides when the user scrolls the webpage ,in such a way that it always on the center on the page... the advantage is that it minimise the scrolling.. so that the user can jump into any page he wants.... Now the challlenge is can anyone make a navigational menu like that preferably in javascript:?:

first repeated element in an array???????

ish_mnnit — Wed, 13 Aug 2008 17:41:16 GMT

give an algo in o(n) to find first repeated element in an array?
e.g.{1,2,3,4,2,1,5,6}
output=2

n largest sum

mnnit.rahul — Wed, 13 Aug 2008 17:45:21 GMT

two arrays of length n (decreasingly sorted) .now take an element from the first array and another from the second and add them both ....
the aim is to find such n largest sums in o(n) complexity

add two integers

Admin — Tue, 19 Aug 2008 14:30:08 GMT

write a program to add two integers without using any arithmetic operators?

Challenging SHOPKEEPER COIN problem

Ramprasadg — Mon, 18 Aug 2008 20:57:24 GMT

remember what sunita mam was saying in class.....i know most of us don't . PROBLEM: given a set of denominations,make an amount with min no of coins. no of coins of each denomination is unlimited. but the catch is that u can also get back money i.e. its like a shop keeper on the other side and not a ATM machine. for eg: given 1 , 10 ,15 as the denominations u can make 20 from 2 coins by 10+10 u can form 5 from 2 coins by 15-10.ie by giving 15 Rs and getting back 10Rs. u can ...

Computer club Question

Ramprasadg — Sat, 16 Aug 2008 13:19:39 GMT

last year in computer club this question was asked...i am pretty sure gaurav-ji knows the ans... given a number n.print all the numbers from 1 till n^2 in a spiral. for example given 3. print the following 1 2 3 8 9 4 7 6 5 for 4 1 2 3 4 121314 5 111615 6 109 8 7 (i am not able to align for n=4 correctly,but i am sure everyone can get it??? : ) please give logic/code....but mainly tell me the class under which it comes if you know