// Robert Sokolowski

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

double n;

double fun(double x)
{
	return 8.0*pow(x,5) - 2.0*pow(x,4) + 15*x*x - 24.0*x + 18.0;
}

double calka(double from, double to)
{
	double ile_f  = (to - from) / n;


	//zaokraglanie w gore i rzutowanie na int


	int ile = ile_f > 0 ? (int)(ile_f + 0.9) : -(int)(ile_f - 0.9);

	int i;

	double podsuma = 0;

	double x = from, y = from + n;

	printf("Od X:%f\t Do X:%f\t ile:%d\t ile_f:%f\n", from, to, ile, ile_f);
	for (i=0; i<ile; i++)
	{
		podsuma += (fun(x) + fun(y)) * n /2.0;
		x = y;
		y += n;
	}

	return podsuma;
}

int main(int argc, char* argv[])
{


	if(argc < 2)
	{
		printf("za malo parametrow");
		return 1;

	}


	n = atof(argv[1]);
	int k = atoi(argv[2]);
	double a, b, suma;

	printf("\n%s: %f,	%s: %d\n\n", "krok(n)", n, "l.proc.potom(k)", k);

	int i, potok[2];
	pipe(potok);
	double skok = 30.0/k;
	double from = -15.0;

	for(i=0;i<k;i++)
	{
		if(fork() == 0)
		{
			a = calka(from, from+skok);
			write(potok[1], &a, sizeof(a));
			exit(0);

		}
		from += skok;
	}

	suma = 0.0;
	for(i=0;i<k;i++)
	{
		read(potok[0], &b, sizeof(b));
		suma += b;
	}

	printf("\nsuma = %f\n", suma);

exit(0);
return 0;

}