/*
* File: worldPop.cpp
*  Purpose: 
*      Estimate the world population growth in a year and
*      also per day.
*      Given that on January 1, 2008 the world's population was
*      estimated at 6,650,000,000 and the estimated growth is
*      at the rate of +1.14%
*/

#include <iostream>
using namespace std;

int main() {
   double population = 665.0;
   double growthRate = 1.14 / 100.0;
   double growthInOneYear = population * growthRate;
   double growthInADay = growthInOneYear / 365;
   cout << "World population on January 1, 2008 is " << population << endl;
   cout << "By Jan. 1, 2009, it will grow by " << growthInOneYear << endl;
   cout << "An average daily increase of " << growthInADay << endl;
	
	double current_pop = population;
	int years = 0;
	while( current_pop < 1000000 ) {
		current_pop = current_pop * 1.14; //shorter form current_pop *= 1.14
						  //short form for self adding +=
						  //short form for self subtracting -=
		years++;
	}
	cout << "Number of Years: " << years << endl;
	
	
	return 0;
}