public class QuadratFloat {

    /* write explicit "float" temporaries to stop compiler using 'double'
     * instead...  (logically) return (-b + sqrt(b*b - 4*a*c))/(2*a);
     */
	private static float root1(float a, float b, float c) {
	    float t1 = b*b - 4*a*c;
	    float t2 = (float) Math.sqrt(t1);
	    float t3 = -b + t2;
	    return t3/(2*a);
	}

	/* write explicit "float" temporaries to stop compiler using 'double'
	 * instead...  (logically) return (-b - sqrt(b*b - 4*a*c))/(2*a);
	 */
	private static float root2(float a, float b, float c) {
	    float t1 = b*b - 4*a*c;
	    float t2 = (float) Math.sqrt(t1);
	    float t3 = -b - t2;
	    return t3/(2*a);
	}

	private static double droot1(double a, double b, double c) {
		return (-b + Math.sqrt(b*b - 4*a*c))/(2*a);   
	}
	
	private static double droot2(double a, double b, double c) {
		return (-b - Math.sqrt(b*b - 4*a*c))/(2*a);   
	}
	
	private static void test(float a, float b, float c) {
	     float r1 = root1(a,b,c);
	     float r2 = root2(a,b,c);
	     double dr1 = droot1(a,b,c);
	     double dr2 = droot2(a,b,c);
	     System.out.printf("%e x^2 + %e x + %e =>\nroot1 %e (or %e)\nroot2 %e (or %e)\n\n",
	            a,b,c, r1,dr1 ,r2,dr2);
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		test(1,-3,2);
		test(1,10,1);
		test(1,100,1);
		test(1,1000,1);
		test(1,10000,1);
	}	

}