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Type: Posts; User: livin

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  1. Replies
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    may be u should look up the Arithmetic operators...

    may be u should look up the Arithmetic operators in C section of the book.

    C - Overview of Operator Types, Arithmetic, Bitwise, Assignment, Precedence Table

    when u do x % y, u get the...
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    Do you need to save the reversed number or print...

    Do you need to save the reversed number or print it to screen?

    If it is just printing out the reverse, I would just repetedly do a number % 10 and print it out. If you need to save it, I would do...
  3. Hmm interesting. So u cannot delete an array with...

    Hmm interesting. So u cannot delete an array with delete() ? I tried delete [] student_details and it worked. I am also learning c++ after learning c. So I thought all free() translate to delete()...
  4. seg fault while deteting the dynamically allocated memory

    Heres the piece of code I wrote to gather student details into a dynamically allocated array of structs. But when I try to delete the memory, it gives me a seg fault. I used print statements to make...
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    Thanks a lot..that helped.

    Thanks a lot..that helped.
  6. Replies
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    869

    multi file programs and structs

    Hi,
    I am trying to work on my first cpp assignment which requires me to break the code into multiple files. I also have to work with structures. I am a little confused as to where my struct...
  7. Yes the above reply is correct. On a more general...

    Yes the above reply is correct. On a more general level, u need to either define the function before you use it or declare it before using it in main and define it after main.
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    Need help with the numa migration code

    Hi ,
    here is the code I am trying to get running on my linux system. I emulated NUMA on my laptop using the numa=fake=2 boot time option. The source code is from the documentation I found...
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    What it means is that u cannot rearrange the...

    What it means is that u cannot rearrange the characters of a string when u declare it as a constant like char *str = "some_string". U can however rearrange the characters when u save the string as an...
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    Yes u are right. I think it was an overseen error...

    Yes u are right. I think it was an overseen error as a result of an unchecked keystroke in vim. But the actual code had a pointer declared.
    Thank you oogabooga. I think that will work. I thought all...
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    help with pointers

    Hi,
    I need help with this program . I am doing something wrong with pointer addition.





    /* program allocates 16 MB of memory on heap and writes to every 2MB interval*/

    #include...
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    yeah I saw that..but I couldn't find anything abt...

    yeah I saw that..but I couldn't find anything abt how to use it right. Could you see some obvious solutions I can try?
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    Need help with write function

    Hi,
    I wrote this small piece of code to test the effect of O_DIRECT flag. But for some strange reason the program fails at the write function line with invalid argument. I cant seem to...
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    iMalc, I dont think allocating bytes+1 is the...

    iMalc, I dont think allocating bytes+1 is the right size. Each page is represented using the last bit of a byte. So I would just be needing as mnay bytes as the pages available. That is why i...
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    k thanks I did that. but removing the (void *) is...

    k thanks I did that. but removing the (void *) is warning me that I am comparing a pointer to an interger. I think (void *) is necessary too. But the actual problem comes when I am freeing the...
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    Hi guys. Sorry for the late response. The code...

    Hi guys. Sorry for the late response. The code was in my laptop and I had to wait till I go home to fetch it. Its part of a bigger shared project. What I am trying to do here is trying to get a...
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    free(): invalid next size (fast)

    Hi,
    I need help with this snippet of code which breaks down at the free() line.




    /* called function */
    unsigned char* func(){
    unsigned long length = 9;
    unsigned char *p = NULL;
  18. Replies
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    Thank you all. I was almost convinced I had some...

    Thank you all. I was almost convinced I had some basic concepts missing. Now it makes sense.
  19. Replies
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    Question on C syntax

    hi,
    I came across this code online on a tutorial site. This part of the code confused me.



    /*
    * parse--split the command in buf into
    * individual arguments.
    */...
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    Need help with file_copy program

    Hi,
    I wrote this simple file copy program to copy contents from input to output file. The program kind of rins into an infinite loop at read/write stage. Can anyone please point out where I am...
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    oh ok. I included the unistd.h and it worked....

    oh ok. I included the unistd.h and it worked. thanks you two!
  22. Replies
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    implicit declaration of function ‘close’

    Hi,
    I wrote a simple piece of code as an exercise in file_descriptors which opens a file and then closes it using open and close. When I try to compile it using the flags -Wall -ansi...
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    Wonderful explanation..thanks a lot.

    Wonderful explanation..thanks a lot.
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    Ok I think I got what u mean when u said u can do...

    Ok I think I got what u mean when u said u can do arithmetic on pointers. But in the line



    I know ptr points to the second element of p which is itself a pointer to an array of integers, arr....
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    I have a slight confusion on the output of first...

    I have a slight confusion on the output of first printf

    when we say *prt-arr, *ptr is a pointer to int and hence holds an address. when we do *ptr - arr, we are subtracting an array arr form...
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