//population prediction
//information source: CIA World Fact Book
//http://www.cia.gov/cia/publications/factbook/geos/xx.html
//c source code by: Jeff Plotkin
//ratjed@spink.net


int year=2002,years=99;
float pop_bil=6.233, new_pop=0;

float death_rate=9.93/1000, birth_rate=21.16/1000; 
//float increase_rate=1.01123;
int main(int argv, char *argc[])
{		
		float increase_rate=birth_rate-death_rate+1;
        printf("\nincrease rate per year (birth_rate-death_rate*1.001)\n\n");
        printf("Year     Population of the world\n");
        int increase_increase=0;
        int increase_tick=0;
        int i=0;
        for (i=0;i<years;i++)
        {
                if (increase_tick==10) { increase_increase=1.01; increase_tick=0; }
                printf("%d:    %f billion increase_rate: %f\n",year,pop_bil,increase_rate);
                increase_rate=increase_rate*1.001;
                new_pop=pop_bil*increase_rate;
                pop_bil=new_pop;
                year++; increase_tick++;
        }
}