Управление памятью процесса

#include "stdafx.h"
#include <windows.h>
#include <iostream>
using namespace std;
int main(){
int *a, *b; // указатель на массив целых чисел
int x=0;
const int size = 1000; // размерность массива
MEMORY_BASIC_INFORMATION mbi;
DWORD mbi_size = sizeof (MEMORY_BASIC_INFORMATION) ;
// резервируем виртуальную память
a = (int*)VirtualAlloc(NULL, size * sizeof(int), MEM_RESERVE, PAGE_READWRITE);
if(!a){
cout << "Virtual allocation failed." << endl;
return GetLastError(); }
cout << "Virtual memory address: " << a << endl;
cin>>x;
if(x==1){
b = (int*)VirtualAlloc(a, size * sizeof(int), MEM_COMMIT, PAGE_READWRITE);}
cout << "Virtual memory address: " << b << endl;
if(mbi_size != VirtualQuery(b, &mbi, mbi_size) ){
cout << "Virual query failed." << endl;
return GetLastError(); }
cout << "Base address: " << mbi.BaseAddress << endl;
cout << "Allocation base: " << mbi.AllocationBase << endl;
cout << "Allocation protect: " << mbi.AllocationProtect << endl;
cout << "Region size: " << mbi.RegionSize << endl;
cout << "State: " << mbi.State << endl;
cout << "Protect: " << mbi.Protect << endl;
printf(mbi.Type==MEM_PRIVATE ? "MEM_PRIVATE" : mbi.Type==MEM_IMAGE ? "MEM_IMAGE" :
mbi.Type==MEM_MAPPED ? "MEM_MAPPED" : "unknown");
cout << endl;
if (!VirtualFree(a, 0, MEM_RELEASE)){ // освобождаем виртуальную память
cout << "Memory release failed." << endl;
return GetLastError(); }
system("pause");
return 0; }