#include "stdafx.h"
#include <iostream>

using namespace std;

struct Rect {
	int top;
	int bottom;
	// define left/right too
};

int calculatePerimeter(Rect r)
{

}

void growByXPercent(Rect *rp, double x)
{
	rp->bottom *= 1 + x;

}

void growByXPercent_(Rect &rp, double x)
{
	rp.bottom *= 1 + x;
}


int main()
{
	Rect rect;
	rect.top = 100;
	rect.bottom = 120;
	int p = calculatePerimeter(rect);
	growByXPercent(&rect, .2);
	growByXPercent_(rect, .2);  // C++ version call by ref
	return 0;
}