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by: dagger |
last post by:
Hi there. I'm using C under FreeBSD with the gcc compiler and am having a
bit of trouble using the calloc and realloc calls.
As an example the code snippet:
#include <stdio.h>
int main() {
char *ptr;
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by: Ramasubramanian XR (AS/EAB) |
last post by:
What is diff b/w malloc,calloc,realloc
could any one explain
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by: Walter Roberson |
last post by:
If realloc() finds it necessary to move the memory block, then
does it free() the previously allocated block?
The C89 standard has some reference to undefined behaviour if one
realloc()'s memory that was freed by realloc(), but the only way
explicitly mentioned in the C89 standard to free memory via realloc()
is to realloc() it down to 0 bytes.
I had always assumed it would automatically free the previous memory,
but is the behaviour...
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by: bwaichu |
last post by:
Is it generally better to set-up a buffer (fixed sized array) and read
and write to that
buffer even if it is larger than what is being written to it? Or is it
better to allocate memory and realloc it for the size of the what is
being written each time? In other words, what is the decision factor
between deciding to use a fixed size buffer or allocating memory
space and reallocing the size?
I don't think the code below is optimal...
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by: ravi.cs.2001 |
last post by:
Hi all,
I m relatively new to C. I have few queries related to malloc():
#1. When we perform malloc(), the memory allocated dynamically comes
from the heap area of the process in concern. Well, we then say that
the heap has shrinked. my query is: Is it that the heap physically
does not shrink but the perticular nodes are marked 'ALLOCATED' and
for subsequent calls to malloc() the memory manager remembers them and
does not reference...
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by: anirbid.banerjee |
last post by:
#include <stdlib.h>
#include <stdio.h>
int main(){
char *ptr = "hello";
ptr = (char *)realloc (ptr,(size_t) 10 * sizeof (char ));
printf ("\n %s", ptr);
return 0;
}
___________________________________
The above program while execution dumps a stack trace and exits. This
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by: banansol |
last post by:
Hi,
I just want to get this right.
A call to realloc() will return NULL on error and the original memory
is left untouched,
both when requesting a larger or a smaller size that the original,
right?
But a call to realloc() with size set to zero is equivalent to free(),
with returns void.
Does that mean that a call to realloc() can fail when shinking memory
except when
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by: marvinla |
last post by:
Hello!
I'm a beginner in C, and I'm having trouble with a pointer-to-pointer
reallocation.
This piece of code works well, but Valkyrie warns some parts (pointed
below), and is
breaking my real code.
#include <stdio.h>
#include <stdlib.h>
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by: Igal |
last post by:
hay, i'm doing this program. having problem wiht realloc in the
function that reads data structures into array (pointer - bp2), this
happens after reading the second record. when call to realloc.
i can't figure out what's wrong, think it's soming got to do with
freeing bp2.
and something called "corruption of the heap".
book* LoadBookData(unsigned *size)
{
FILE* fp;
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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