/* vjezba 6, zadatak 13 */
/* napisati rjesenja bikadratne jednadzbe a*x**4+b*x**2+c=0 */
/* koeficijente napisati na zaslon i ispisati sva dobivena rjesenja */

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

void main()
{
	int a,b,c;
	double d,tmp1,tmp2;

	clrscr();
	printf("A(x**4) + B(x**2) + C = 0\n");
	printf("Unesi A, B, C: ");
	scanf("%d %d %d",&a,&b,&c);
	d=b*b-4*a*c;
	if (d>=0)
	{
		tmp1=(-b+sqrt(d))/2./a;
		tmp2=(-b-sqrt(d))/2./a;
		(tmp1>=0)?printf("\nx=%f",sqrt(tmp1)):printf("\nx=%fi",sqrt(-tmp1));
		(tmp1>=0)?printf("\nx=%f",-sqrt(tmp1)):printf("");
		(tmp2>=0)?printf("\nx=%f",sqrt(tmp2)):printf("\nx=%fi",sqrt(-tmp2));
		(tmp2>=0)?printf("\nx=%f",-sqrt(tmp2)):printf("");
	}
	else
	{
		tmp1=-b/2./a;
		tmp2=sqrt(-d)/2./a;
		printf("\n(x**2)=%f+%fi",tmp1,tmp2);
		printf("\n(x**2)=%f-%fi",tmp1,tmp2);
	}
	getch();
}