Expected '(' function style cast or type construction

#include <iostream>
#include <algorithm>

bool search(int a[], size_t size, int item)
{
  int beg = 0;
  int end = size-1;

  while (true)
  {
    if ( (beg + 1) >=  end)  
      return (item == a[end] || item ==a[beg]);
    int mid = (beg+end)/2;
    if ( item == a[mid])
      return true; 
    else if ( item < a[mid] )
      end = mid;
    else  
      beg = mid;
  }
}
enum { max_size = 90 };
int main()
{

  int a[max_size];

  int item;
  std::cout << "Enter the item to search for ";
  std::cin >> item;

  size_t size;
  std::cout << "Enter the array size ";
  std::cin >> size;

  if ( size > max_size)
  {
    std::cerr << "wrong input\n";
    return -1;
  }

  std::cout << "Enter the array elements\n";

  for (size_t n = 0; n< size; ++n)
    std::cin >> a[n];

  std::sort( &a[0], &a[size]);

  bool found  = search( a, size, item);
  std::cout << "The item is " << (found ? "found\n" : "not found\n");
}

#include <iostream>
#include <algorithm>
#include <vector>

int main()
{
  int item;
  std::cout << "Enter the item to search for ";
  std::cin >> item;

  size_t size;
  std::cout << "Enter the array size ";
  std::cin >> size;

  std::cout << "Enter the array elements\n";
  std::vector<int> v;
  v.resize(size);

  for (auto & x : v)
    std::cin >> x;

  sort(v.begin(), v.end());

  auto found =  binary_search(v.begin(), v.end(), item);
  std::cout << "The item is " << (found ? "found\n" : "not found\n");

}