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Join Date: Jan 2004
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Newbie Poster
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"
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"
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Join Date: Mar 2004
Posts: 76
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Junior Poster in Training
1) b/c C is a minimal, spartan like language
2) shift each bit out and test it:
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
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);
#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
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Join Date: Mar 2004
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Code Guru
#3
Mar 27th, 2004
I disagree C does have nested functions...recursion is pretty nested to me.
A Hacker's Mind:
"I thought what I'd do was, I'd pretend I was one of those deaf-mutes..." - J.D.Salinger
"I thought what I'd do was, I'd pretend I was one of those deaf-mutes..." - J.D.Salinger
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Join Date: Mar 2004
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Junior Poster in Training
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.
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Join Date: Dec 2003
Location: Nashville, TN
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ummm... are we sure this is an interview? This sounds more like a homework assignment to me... Who's doing the interviewing?
Alex Cavnar, aka alc6379
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Code Guru
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Originally Posted by 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.
maybe the interview is a homework assignment :lol:
A Hacker's Mind:
"I thought what I'd do was, I'd pretend I was one of those deaf-mutes..." - J.D.Salinger
"I thought what I'd do was, I'd pretend I was one of those deaf-mutes..." - J.D.Salinger
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Join Date: Mar 2004
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Junior Poster in Training
exactly.
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Join Date: Feb 2002
Location: Long Island, NY
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Infamous, you have better things to do than waste your time doing someone else's homework.
_.:: my websites ::._
blog @ www.samaru.net * engi No Jutsu @ www.narutorp.net * portfolio @ shinylight.com
deviantART: inscissor
blog @ www.samaru.net * engi No Jutsu @ www.narutorp.net * portfolio @ shinylight.com
deviantART: inscissor
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Join Date: Mar 2004
Posts: 76
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Junior Poster in Training
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.
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