quadraticequation.java

来自「Produce Java classes to calculate and di」· Java 代码 · 共 69 行

public class QuadraticEquation
{

	//----------------FIELDS---------------------
	private static double a;
	private static double b;
	private static double c;
	private static double discriminant;
	private static double root;
	private static double root1;
	private static double root2;

	//-------------CONSTRUCTOR-------------
	public QuadraticEquation(double newA, double newB, double newC)
	{
		a = newA;
		b = newB;
		c = newC;
	}

	//---------------METHOD-----------------
	public static void calcDoubleRoot()
	{
		root1 = (-b + Math.sqrt(b * b - 4 * a * c)) / (2 * a);
		root2 = (-b - Math.sqrt(b * b - 4 * a * c)) / (2 * a);
	}

	public static double getDoubleRoot1()
	{
		return (root1);
	}

	public static double getDoubleRoot2()
	{
		return (root2);
	}

	public static void calcRoot()
	{
		if((a==0)&&(b==0))
		{
			System.out.printf("\nNo solution");
		}
		else if ((a == 0) && (b != 0))
		{
			root = -c / b;
			System.out.printf( "\nResult:%.4f",root);
		}
		else
		{
			if ((b * b - 4 * a * c) < 0)
			{
				System.out.printf("\nNo solution");
			}
			else if ((b * b - 4 * a * c) > 0)
			{
				QuadraticEquation.calcDoubleRoot();
				root1 = QuadraticEquation.getDoubleRoot1();
				root2 = QuadraticEquation.getDoubleRoot2();
				System.out.printf("\nResult_1: % .4f \tResult_2: % .4f", root1, root2);	
			}
			else
			{
				root = -(b / (2 * a));
				System.out.printf("\nResult:%.4f", root);
			}
		}
	}
}