Preparing for an interview and need some questions answered

[Dwija]

Hello
Members/Administrator

I urgently needed help for the following questions as
i have very little time in my hand for preparing the interview.

->Why doesn't C have nested functions?
->What is the most efficient way to count the number of bits which are set in a value?
->How can I call a function, given its name as a string?
->How can I return multiple values from a function?
->How can I invoke another program from within a C program?
->How can I access memory located at a certain address?
->How can I allocate arrays or structures bigger than 64K?
->How can I find out how much memory is available?
->How can I read a directory in a C program?
->How can I increase the allowable number of simultaneously open files?
->What's wrong with the call "fopen("c:\newdir\file.dat", "r")"?

its
"dwija"

[infamous]

1) b/c C is a minimal, spartan like language
2) shift each bit out and test it:

unsigned int num = 0xdeadbeef;
 for(int x = 0; x < (sizeof(int) * 8); x++)
 	if(num & (1 << x) ) printf("bit %d is on\n", x);

3)using the `stringification' operator in a preprocessor macro:
#define(func2call) #func2call()
4)by passing some arguments by reference, or by returning a structure packed full of stuff
5)by using execve() or CreateProcess()
6)by dereferencing a p ointer to that address
7)the only limit on dynamically allocated memory is the size of ur RAM i believe
8)see above
9)by using the readdir() function
9)by suing the setrlimit() function in linux
10)looks fine to me

[BountyX]

I disagree C does have nested functions...recursion is pretty nested to me.

[infamous]

that's not what 'nested' functions means. nested functions means being able to define a function inside another. and some compilers allow and others dont, so it's not something u can rely on.

[alc6379]

ummm... are we sure this is an interview? This sounds more like a homework assignment to me... Who's doing the interviewing?

[BountyX]

that's not what 'nested' functions means. nested functions means being able to define a function inside another. and some compilers allow and others dont, so it's not something u can rely on.

oh, i see. Sounds like java, main is inside another class method, is that a correct analogy?

maybe the interview is a homework assignment :lol:

[infamous]

exactly.

[samaru]

Infamous, you have better things to do than waste your time doing someone else's homework.

[infamous]

what am i, psychic? i didnt know if it was homework or not, i was just trying to clear up some of the old posts; worry about yourself. that post was almost 3 months old anyhow, dont think it helped him much if it was homework.

[BountyX]

well it helped me at least, now I know what a nested function is :D

[neoderf]

well dicounting the other questions
lets drop the how and the way you solve the can i part is

yes!!!!!