/**************************************************************************/
/* Author: Chang												          */
/* Aim for: CS135 class				   									  */
/* Problem: This program illustrates simple function usage.     		  */
/**************************************************************************/
//preprocessor directives
#include <iostream>
using namespace std;

int sum_of_doubles(int , int, int); 

int main ()
{
    int x, y, z;
    int sum = 0;
    x = 5; y = 2; z = 4;
    cout <<x<<" "<<y<<" "<<z;
    
    sum = sum_of_doubles(x, y, z);
    
    cout <<endl<<x<<" "<<y<<" "<<z;
    cout <<endl<<"Sum is " <<sum <<endl;
    system ("PAUSE");
    return 0;
    }

int sum_of_doubles (int a, int b, int c)
{
    int result; 
    a = 2*a;
    b = 2*b;
    c = 2*c;
    cout <<endl<<a<<" "<<b<<" "<<c;
    result = a + b + c;
    return result; 
}