Thread: a link list code question..

i free every memory allocation(in this case "new" command)

just by adding
free()

in the end of a code
even if there have been many "new" or "malloc" or "calloc"
?

free() what you malloc() calloc() or realloc()
delete what you new
delete [] what you new[]

http://www.cplusplus.com/reference/c...dlib/free.html
http://www.cplusplus.com/doc/tutorial/dynamic.html

i looked at the delete example the are marked

i saw these command on c++
are commands like >> cin
present in normal C ?

also it says
"Operators new and delete are exclusive of C++"

i need a linked list tutorial only for C language
i find always articles mixed with C++
i cant use C++ command
but on the other hand i know that concepts like "new" is the basis for linked list

where can i find such stuff only on C ?

Code:

// rememb-o-matic
#include <iostream>
#include <new>
using namespace std;

int main ()
{
  int i,n;
  int * p;
  cout << "How many numbers would you like to type? ";
  cin >> i;
  p= new (nothrow) int[i];
  if (p == 0)
    cout << "Error: memory could not be allocated";
  else
  {
    for (n=0; n<i; n++)
    {
      cout << "Enter number: ";
      cin >> p[n];
    }
    cout << "You have entered: ";
    for (n=0; n<i; n++)
      cout << p[n] << ", ";
    delete[] p;
  }
  return 0;
}

Originally Posted by robwhit

Code:

struct list_el {                         //type struct list_el
typedef struct list_el item;         //item is alias for struct list_el
void main() { http://faq.cprogramming.com/cgi-bin/...&id=1043284376
      curr = (item *)malloc(sizeof(item)); http://faq.cprogramming.com/cgi-bin/...&id=1043284351

i read the melloc casting link

i understad that in first we needed to do casting to the type of pointer like:

Code:

double *p;
p = (double *)malloc ( n * sizeof ( double ) );

but after some time iso C was updated and void pointer was created
so we dont need to do casting just:

Code:

double *p;
p = malloc ( n * sizeof ( double ) );

i use ansi c not iso C

what type of malloc code i need to use?

Yes, only if you are using C++ do you need to cast malloc() [and in C++, you _SHOULD_ be using new/delete rather than malloc/free]. Support for malloc in C++ is still there so that it is possible to compile old code written in C with the C++ compiler for backwards compatibility.

--
Mats