/* Examples of typical uses of arrays 


Laura Toma 
Csci 107

*/


#include <iostream.h>

int main() {
  
  //declare a constant indicating the number of items in the array
  const int NUM = 10;
  int i, below;

  //declare an array that can hold NUM items; the array is not
  //initialized, that is, its contents are garbage until a value is
  //assigned to each item in the array
  int a[NUM]; 

  //assign values to the items in the array

  //you can assign a value to a particular item in the array, as
  //the following statement shows: 
  //a[3] = 25; 
  //but doing something to ALL items in the array is far more common
  //than doing something to a single item; below we read the values
  //in the array, one by one, from the user; you can use cin to put
  //values from the user directly into the array
  i = 0;
  while (i< NUM) {
    //read a value into the i-th item 
    cout <<"Enter a value for element " << i << ":";
    cin >> a[i];
    i = i+1;
  }

//print the array 
  i = 0;
  cout << "You entered the array: ";
  while (i< NUM) {
    //print the value in the i-th item followed by a space
    cout << a[i] << " ";
    i = i+1;
  }
  //print a new line at the end
  cout << endl;

  
  //now we do something with the array; for instance, let's assume we
  //want to count how many items in the array are negative; 
  i = 0;
  below = 0; //nb of items below zero 
  while (i< NUM) {
    if (a[i] <0) below = below + 1;
    i = i+1;
  }

  //now we print what we found
  cout <<"The array contains " << below << " negative items\n";

  
  return 0;
}