A very simple program which shows the evolution of a village. Just use Excel, it's better.

villages.cpp

#include <cstdlib>
#include <iostream>
#include <string>
using namespace std;

#define POPULATION_DENSITY 10
#define GAME_LENGTH 10

class village
{
public:
  string name; // village name
	int population; // village population
	float size; // village size in sqkm
	int x; // village centre's x-coordinate
	int y; // village centre's y-coordinate
	int step; // turn number
	
	village()
	{
		this->name = "The Compound";
		this->population = 10;
		this->size = this->population / POPULATION_DENSITY;
		this->x = 0;
		this->y = 0;
		this->step = 0;
		this->growth = 0.10;
	}

	int update(void)
	{
		this->updatePopulation();
		this->updateSize();
		this->addStep();

		return this->step;
	}

private:
	float growth; // village growth rate

	void updatePopulation(void)
	{
		this->population = this->population + (this->population * this->growth);
	}

	void updateSize(void)
	{
		this->size = this->population / POPULATION_DENSITY;
	}

	void addStep(void)
	{
		this->step = this->step++;
	}
};


int main(void)
{
  village VILLAGE;
	int i = 0;

	for(i = 0;i <= GAME_LENGTH;i++)
	{
		cout<<VILLAGE.name<<":"<<endl;
		cout<<"----------Year "<<VILLAGE.step<<"----------"<<endl;
		cout<<"Population: "<<VILLAGE.population<<endl;
		cout<<"Land Area: "<<VILLAGE.size<<"sqkm"<<endl<<endl;
		VILLAGE.update();
	}

	return 0;
}