#include <iostream>
using namespace std;

// the print_array() is a "general-purpose function"
//   to print all values of an array
void print_array( int a[], int length )
{
    for ( int i = 0 ; i < length ; i++ )
    {
        cout << a[i] << ' ';
    }
    cout << endl;
}

// the array_add() function adds x to each element
//   of the given array
// when we use int[], the values in the array
//   can be changed in the function (i.e. we'll see
//   those changes back in main())
void array_add( int a[], int length, int x )
{
    for ( int i = 0 ; i < length ; i++ )
    {
        a[i] += x;
    }
}

int main()
{
    const int ARRAY_SIZE = 5;
    int numbers[ ARRAY_SIZE ] = { 4, 6, 8, 9, 11 };
    print_array( numbers, ARRAY_SIZE );
    array_add( numbers, ARRAY_SIZE, 10 );
    print_array( numbers, ARRAY_SIZE );
    return 0;
}