package com.ruminay.math;
import java.util.Scanner;
import java.lang.Math;

public class Operations {

	
	public void quadratic(){
		
		Scanner scanObj = new Scanner(System.in);
		double a = 0; //ax^2
		double b = 0; //bx
		double c = 0; //c
		double dis = 0; //The discriminant (b^2-4ac) 
		double x1 = 0; //first, sometimes only, root
		double x2 = 0; //second root. Only used when there are two roots.
		
		System.out.println("------------------------------------------------"); //Signify new section.
		System.out.println("aX^2+bX+c=0");
		System.out.println("Please input a, b, and c. Doubles are allowed."); 
		System.out.print("a?:"); a=scanObj.nextDouble();
		System.out.print("b?:"); b=scanObj.nextDouble();
		System.out.print("c?:"); c=scanObj.nextDouble();
		System.out.println();
		
		dis=((b*b)-(4*a*c));
		if(dis==0) //first case
		{
			x1=(-b)/(2*a);
			System.out.println("\tDiscriminant = 0. One real root.");
			System.out.println("\tX = "+x1);
		}
		if(dis>0) //second case
		{
			x1=((-b)+(Math.sqrt((b*b)-(4*a*c))))/(2*a);
			x2=((-b)-(Math.sqrt((b*b)-(4*a*c))))/(2*a);
			System.out.println("\tDiscriminant > 0. Two real roots.");
			System.out.println("\tX1 = "+x1);
			System.out.println("\tX2 = "+x2);
		}
		if(dis<0) //third case
		{
			System.out.println("\tDiscriminant < 0. No real roots.");
		}
		
		
	}
	public void linear(){
		
		Scanner scanObj = new Scanner(System.in);
		double x = 0;
		double y = 0;
		
		double a,b,c,d,e,f = 0;
		
		System.out.println("------------------------------------------------"); //Signify new section.
		System.out.println("aX+bY=c"); //Tell the user the equations being used.
		System.out.println("dX+eY=f");
		System.out.println("Please input a, b, c, d, e, and f. Doubles are allowed.");
		System.out.print("a?:"); a=scanObj.nextDouble(); //Get all the variables. No \n's are necessary because the scanner makes one when taking input.
		System.out.print("b?:"); b=scanObj.nextDouble();
		System.out.print("c?:"); c=scanObj.nextDouble();
		System.out.print("d?:"); d=scanObj.nextDouble();
		System.out.print("e?:"); e=scanObj.nextDouble();
		System.out.print("f?:"); f=scanObj.nextDouble();
		
		x=((e*c-b*f)/(e*a-b*d));
		y=((c-a*x)/b);
		
		System.out.println("\tX = "+x);
		System.out.println("\tY = "+y);
		
	}
}