#include <iostream>
#include <windows.h>

int func1() {
  // Allocate memory for an array of 5 integers
  int* arr1 = (int*)malloc(5 * sizeof(int));

  // Check if the allocation was successful
  if (arr1 == nullptr) {
    std::cerr << "Memory allocation failed" << std::endl;
    return 1;
  }

  // Initialize the array
  for (int i = 0; i < 5; ++i) {
    arr1[i] = i * 2;
  }

  // Print the array
  std::cout << "Array 1 elements:" << std::endl;
  for (int i = 0; i < 5; ++i) {
    std::cout << arr1[i] << " ";
  }
  std::cout << std::endl;


  // Resize the array to hold 10 integers
  int* newArr1 = (int*)realloc(arr1, 10 * sizeof(int));

  // Check if the reallocation was successful
  if (newArr1 == nullptr) {
    std::cerr << "Memory reallocation failed" << std::endl;
    free(arr1); // Free the original memory block
    return 1;
  }

  // Initialize the new elements
  for (int i = 5; i < 10; ++i) {
    newArr1[i] = i * 2;
  }

  // Print the resized array
  std::cout << "Resized array elements:" << std::endl;
  for (int i = 0; i < 10; ++i) {
    std::cout << newArr1[i] << " ";
  }
  std::cout << std::endl;

  // Free the allocated memory
  free(newArr1);

  return 0;
}

int func4(){
  SIZE_T size = 1024 * 1024;
  LPVOID lpAddress = VirtualAlloc(
    NULL,                // Let the system determine the address
    size,                // Size of the memory block
    MEM_COMMIT | MEM_RESERVE, // Allocate and reserve memory
    PAGE_READWRITE       // Read and write access
  );

  // Check if the allocation was successful
  if (lpAddress == NULL) {
    std::cerr << "Memory allocation failed with error: " << GetLastError() << std::endl;
    return 1;
  }

  std::cout << "Memory allocated at address: " << lpAddress << std::endl;

  // Use the allocated memory (example: fill with zeros)
  memset(lpAddress, 0, size);

  // Free the allocated memory
  if (!VirtualFree(lpAddress, 0, MEM_RELEASE)) {
    std::cerr << "Memory free failed with error: " << GetLastError() << std::endl;
    return 1;
  }

  std::cout << "Memory freed successfully." << std::endl;
  return 0;
}

void main() {
  std::cout << "hello ------- pdb test" << std::endl;
  func1();
  func4();
}