can someone please point out what im doing wrong

[terrorofdeath]

im trying to create a class type structure using struct instead of classes i dont know what im doing wrong i have one working code and i have some thing
else im working on.

working

#include <iostream>
#include <stdlib.h>

using namespace std;

struct myclass
{
   int * array;
   int nelements;
};

struct myclass constructor(struct myclass n,int size)
{
   int * array = NULL;
    array = (int *)malloc(size * sizeof(int));
    if(array == NULL)
    {
      cerr << "memory could not be allocated." <<endl;
    }else 
    {
      cout << "memory allocated." <<endl;
    }
    
    n.array = array;
    n.nelements = size;
    
    return n;
}

void initializeobjects(int * array,int size)
{
  for(int i = 0; i < size; i++)
  array[i] = rand() % 100 + 1;
}

void printobjects(int * array,int size)
{
     for(int i = 0; i < size; i++)
     {
       cout << " value "  <<array[i] << endl;
     }
}



int main()
{
    struct myclass m;
    m.nelements = 12;
    
    m = constructor(m,m.nelements);
    initializeobjects(m.array,m.nelements);
    printobjects(m.array,m.nelements);
    
    system("pause");
    return 0;
}

im trying to do the same thing only using arrays instead. the program malfunction

#include <iostream>

using namespace std;

struct myclass
{
   int array[];  //size not defined
   int nelements;
};

void constructor(int * array,int size)
{
    array = NULL;
    array = (int *)malloc(size * sizeof(int)); //size defined here
}

void initializeconstrut(int * array,int size)
{
  for(int i = 0; i < size; i++)
  array[i] = i;
}

void print(int * array,int size)
{
     for(int i = 0; i < size; i++)
     {
       cout << " value "  <<array[i] << endl;
     }
}

int main()
{
    struct myclass m;
    m.nelements = 12;
    
    constructor(m.array,m.nelements);
    initializeconstrut(m.array,m.nelements);
    print(m.array,m.nelements);
    
    system("pause");
    return 0;
}

guess what im asking is using the pointer in the
first code section better or is there another way'
i dont know about making the second code work.

thanks and best regards.