MAIN.CXX

We can accomodate a flexible number of items by using a Standard Template Library vector.
The vector class is similiar to an array but can be expanded dynamically through the push_back method.
The standard C++ library includes the function random() which can be used to regenerate a random number.

#include <vector.h>
#include <iostream.h>
#include "ball.h"

int main (void)
	{
	sphere mySphere;
	mySphere.setRadius(10.0);
	cout << "mySphere has radius: " << mySphere.getRadius() << endl;
	sphere myOtherSphere;
	myOtherSphere.copy(mySphere);
	myOtherSphere.setPosition(3.0,4.0,10.0);
	cout << "myOtherSphere has radius: " << myOtherSphere.getRadius() << endl;
	cout << "myOtherSphere has X position: " << myOtherSphere.getXPosition() << endl;
	vector<ball*> myBallArray;
	//create a new ball
	myBallArray.push_back(new ball);
	//initialize the ball position
	myBallArray[0]->setPosition(3.0,4.0,10.0);
	myBallArray[0]->setRadius(20.0);
	myBallArray[0]->setVelocity(0.2,0.0,1.0);
	//generate a random number of balls to create between 0 and 200
	int maxBallNumber = random()%200;
	int ballNumber = 0;
	while (1)
		{
		//report the ball position and velocity of the last ball created
		cout << "myBall has position X: " << myBallArray[ballNumber]->getXPosition();
		cout << " Y: " << myBallArray[ballNumber]->getYPosition();
		cout << " Z: " << myBallArray[ballNumber]->getZPosition() << endl;
		cout << "myBall has velocity X: " << myBallArray[ballNumber]->getXVelocity();
		cout << " Y: " << myBallArray[ballNumber]->getYVelocity();
		cout << " Z: " << myBallArray[ballNumber]->getZVelocity() << endl;
		for ( i=0; i<ballNumber; i++)
			{
			//simulate the ball flight
			myBallArray[i]->fall();
			//start the ball again if resting
			if (myBallArray[i]->getZPosition() <= 0.0)
				{
				myBallArray[i]->setPosition(3.0,4.0,10.0);
				myBallArray[i]->setVelocity(0.2,0.0,1.0);
				}
			}
		if (ballNumber < maxBallNumber)
			{
			//increment the number of balls in flight
			ballNumber++;
			//create a new ball
			myBallArray.push_back(new ball);
			//initialize the ball position
			myBallArray[ballNumber]->setPosition(3.0,4.0,10.0);
			myBallArray[ballNumber]->setRadius(20.0);
			myBallArray[ballNumber]->setVelocity(0.2,0.0,1.0);
			}
		}
	};