---------------------------DLL
extern "C" __declspec(dllexport) int *PushBack(int *x, int &N, int pb)
{
	N++;
	pb=1;
	int *tmp=new int[N];
	for(int i=0; i<N-1; i++)
	{
		tmp[i]=x[i];
	}
	tmp[N-1]=pb;
	delete []x;
    return tmp;
}

---------------------------EXE
#include<iostream>
#include <time.h>
#include <windows.h>
using namespace std;
typedef int*(*functionDll)( int *, int&, int );
int main()
{
	HMODULE hLib = LoadLibrary("DLL_Test.dll");
	if(hLib)
	{
        functionDll fpFunction = (functionDll)GetProcAddress(hLib,"PushBack");
		if(fpFunction)
		{
            cout << "Function load." << endl;
        
			srand ( time(NULL) );
			int N =rand() % 10 + 1;   //радномим длинны массивов
			int *y;
			int *x=new int [N];   //выделяем память для матрицы х

			for(int i=0; i<N; i++)
			{
				x[i]=rand() % 100 + 1;
			}

			cout<<"mass X"<<endl;
			for(int i=0; i<N; i++)
			{
				cout<<x[i]<<" ";
			}

			y=fpFunction(x,N,10);

			cout<<endl<<"mass X"<<endl;
			for(int i=0; i<N; i++)
			{
				cout<<y[i]<<" ";
			}
		}
		else
		{
			cout<<"don't load";
		}
	}
	else
	{
		cout<<"don't load";
	}
	getchar();
	getchar();
}