/*
   testalloc2.cpp
   CIS 150
   David Klick
   6/26/08
   
   Demonstration of allocating memory for an array.
*/

#include <iostream>
using std::cin;
using std::cout;

void cont();

int main() {
   int size;  // holds size of array
   int i, sum;
   int *arr;  // pointer for array we will create
   
   // find out how large the user would like the array to be
   do {
      cout << "Enter array size (1-10): ";
      cin >> size;
      if (size < 1 || size > 10) {
         cout << "Error: Invalid size\n";
      }
   } while (size < 1 || size > 10);

   // create the array
   arr = new int[size];
   
   // get numbers for array from user
   for (i=0; i<size; i++) {
      cout << "Enter element " << i << ": ";
      cin >> *(arr+i);
   }
   
   // add up all the elements of the array
   sum = 0;
   for (i=0; i<size; i++) {
      sum += *(arr+i);
   }
   cout << "The sum is " << sum << '\n';   

   // free array memory
   delete[] arr;

   cont();
   return 0;
}

/*
   void cont();
   
   Arguments: none
   
   Returns: nothing
   
   Clears input buffer and pauses waiting for user 
   to press Enter.
*/
void cont() {
   if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
   cout << "Press enter to continue...";
   cin.get();
}

/*
   Sample output:
   
   Enter array size (1-10): -2
   Error: Invalid size
   Enter array size (1-10): 12
   Error: Invalid size
   Enter array size (1-10): 5
   Enter element 0: 12
   Enter element 1: 18
   Enter element 2: -20
   Enter element 3: 15
   Enter element 4: 5
   The sum is 30
*/