Preparing for an interview and need some questions answered
 

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"

Re: Its important,Plz hlp
 

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

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

Re: Its important,Plz hlp
 

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.

Re: Preparing for an interview and need some questions answered
 

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

Re: Its important,Plz hlp
 

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:

Re: Its important,Plz hlp
 

exactly.

Re: Preparing for an interview and need some questions answered
 

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

Re: Preparing for an interview and need some questions answered
 

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.

Re: Preparing for an interview and need some questions answered
 

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