Second degree equation

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This is probably a question that has already answered too much here, but of course, I did not find the solution. The only thing I need is to take the calculation I made in main to another class, returning to the main only result.

  • I made a few attempts and what I got was a comeback, Nan. it is worth noting that I am still new to java (alias, in all kkkk languages)
  • I have a second class where I put the methods, but I wish there was a third. It would then be the main, just collecting and returning the values, the Data class, storing the data, and finally the formulas that would carry out the calculations.

follow what I have so far:

package atividade;

import java.util.Scanner;

public class Principal {
    public static void main(String[] args) {
        Scanner num = new Scanner (System.in);

        Dados f = new Dados();
        System.out.print("Informe os valores abaixo:\n"
                + "A: ");
        f.setA(num.nextDouble());
        System.out.print("B: " );
        f.setB(num.nextDouble());
        System.out.print("C: ");
        f.setC(num.nextDouble());
        System.out.println("\nValores informados: \nA: " + f.getA() +"\nB: " + f.getB() + "\nC: " + f.getC());
        double delta, x1, x2;
        delta = f.getB()*f.getB()-4*f.getA()*f.getC();
        x1 = (f.getB()+ Math.sqrt(delta))/(2*f.getA());
        x2 = (f.getB()- Math.sqrt(delta))/(2*f.getA());
        System.out.println("S={" + x1 + ", " + x2 + "}");
    }    
}

package atividade;

public class Dados {
    private double a;
    private double b;
    private double c;    

        public double getA() {
        return a;
    }
        public void setA(double a) {
        this.a = a;
    }
        public double getB() {
        return b;
    }
        public void setB(double b) {
        this.b = b;
    }
        public double getC() {
        return c;
    }
        public void setC(double c) {
        this.c = c;
    }          
}
java
  • 1

    Instead of initializing the attributes of the Data class with setters, you should do this with a constructor. And what is the responsibility of the Data class? Save data from a quadratic expression? So it should be called Expression and it should itself calculate its roots.

  • 2

    This answers your question? Code for calculating 2nd degree equation returns "Nan" as roots

  • Opa @Vandersantos, I’ll follow this tip then.

  • @Marcosalexandre did help! vlw!!

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