//Demonstration program for the function scale.
#include <iostream.h>
#include <math.h>

void scale(int a[], int size);
//Precondition: a[0] through a[size-1] each have a nonnegative value.
//Postcondition: a[i] has been changed to the number of 1000s (rounded to
//an integer) that were originally in a[i], for all i such that 0 <= i <= size-1

int round(double number);
//Precondition: number >= 0. 
//Returns number rounded to the nearest integer.

int main( )
{
    int some_array[4], index;

    cout << "Enter 4 numbers to scale: ";
    for (index = 0; index < 4; index++)
        cin >> some_array[index];

    scale(some_array, 4);

    cout << "Values scaled to the number of 1000s are: ";
    for (index = 0; index < 4; index++)
    cout << some_array[index] << " ";
    cout << endl;

    return 0;
}

void scale(int a[], int size)
{
    for (int index = 0; index < size; index++)
        a[index] = round(a[index]/1000.0);
}

//Uses math.h:
int round(double number)
{
    return floor(number + 0.5);
}