/*Gavin Grimes	EECS 10 Assignment 4

Date Created: 10/23/2010
Date Last Modified: 10/23/2010*/

#include <stdio.h>

int main(void)
{
	double	wolfpopulation = 0;		/*initial wolf population*/
	double	wolfpopulation2 = 0;	/*wolf population of a given year*/
	double	wolfgrowthrate = 0;		/*population growth rate of wolves input by user*/
	double	rabbitpopulation = 0;	/*initial rabbit population*/
	double	rabbitpopulation2 = 0;	/*rabbit population of a given year*/
	double	rabbitgrowthrate = 0;	/*population growth rate of rabbits input by user*/
	double	grassarea = 0;			/*initial grass area (in sq yds)*/
	double	grassarea2 = 0;			/*grass area (in sq yds) of a given year*/
	double	grassgrowthrate = 0;	/*growth rate of grass area input by user*/
	int		x = 0;					/*counter*/

	printf("Enter wolf population (initial):");
	scanf("%lf", &wolfpopulation);
	printf("Enter rabbit population (initial):");
	scanf("%lf", &rabbitpopulation);
	printf("Enter total grass area, initially fertile (in sq yards):");
	scanf("%lf", &grassarea);
	printf("Enter wolf annual growth rate (in percentage):");
	scanf("%lf", &wolfgrowthrate);
	printf("Enter rabbit annual growth rate (in percentage):");
	scanf("%lf", &rabbitgrowthrate);
	printf("Enter grass area annual growth rate (in percentage):");
	scanf("%lf", &grassgrowthrate);

	printf("Year\t\tWolf Population\tRabbit Population\tAvailable Grass Area\n");	/*First line of output table*/
	printf("%d\t\t%f\t%f\t%f\n", x, wolfpopulation, rabbitpopulation, grassarea);	/*Output for year zero (initial values)*/
	x++;
																					/*adds one to x, making x == 1*/
	while (x < 21){

		if (x % 5 == 1){

			grassarea = (grassarea * (1 + grassgrowthrate / 100)) - (rabbitpopulation * 1.2);

			rabbitpopulation = (int) ((rabbitpopulation * 1 + (rabbitgrowthrate / 100)) - (wolfpopulation * 50));

			wolfpopulation = (int) (wolfpopulation * 0.5);

			printf("%d\t\t%d\t%d\t%f\n", x, wolfpopulation, rabbitpopulation, grassarea);

			x++;
		}
		else{

			grassarea = (grassarea * (1 + grassgrowthrate / 100)) - (rabbitpopulation * 1.2);

			rabbitpopulation = (int) ((rabbitpopulation * (1 + rabbitgrowthrate / 100)) - (wolfpopulation * 50));

			wolfpopulation = (int) (wolfpopulation * (1 + wolfgrowthrate / 100));

			printf("%d\t\t%d\t%d\t%f\n", x, wolfpopulation2, rabbitpopulation2, grassarea2);

			x++;
			}
	}

			return 0;
}