How can I get an exception from a quadratic formula?

Question

package com.mycompany.mavenproject1;

import java.util.Scanner;

public class Mavenproject1 {

    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        double a, b, c;
        double x1, x2;
        System.out.println("Ingresa el valor de a: ");
        a = sc.nextDouble();
        System.out.println("Ingresa el valor de b: ");
        b = sc.nextDouble();
        System.out.println("Ingresa el valor de c: ");
        c = sc.nextDouble();

        try {
            x1 = ((-b) - (Math.sqrt(Math.pow(b, 2) - 4 * a * c))) / 2 * a;
            x2 = ((-b) + (Math.sqrt(Math.pow(b, 2) - 4 * a * c))) / 2 * a;
            System.out.println("x1: " + x1 + ", x2: " + x2);
        } catch (Exception e) {
            System.out.println("Hay un problema");
        }

    }
}

Answer 1

B is value to get square root from answer , then you want to throw exception.

Example: √0^2 = 0, then yeah not divisible.

Solution:

use If-else statement and throw exceptions(custom or default).

//If square root B is 0, then Throw error

try {
    if(b == 0){
        throw new Exception();
    }
    else {
    x1 = ((-b) - (Math.sqrt(Math.pow(b, 2) - 4 * a * c))) / 2 * a;
    x2 = ((-b) + (Math.sqrt(Math.pow(b, 2) - 4 * a * c))) / 2 * a;
    System.out.println("x1: " + x1 + ", x2: " + x2);
    }

    } catch (Exception e) {
        System.out.println("There is A Problem");
    }

I replicated It, and this is bonus for you: https://onlinegdb.com/9oqNMLySU

Give a thumbs up if it helps. Gladge

Answer 2

Arithmetic with double values does not throw exceptions. Nor does taking a square root of zero or a negative number. So your code going to have to test for specific inputs (or results) and throw an exception explicitly.

Hints:

• read the javadocs for Math.sqrt(double) and Double.isNaN(double)

• read about what NaN means in floating point arithmetic,

• read about √-1 and complex numbers (if you have forgotten your high-school math classes),

• do some algebra to figure out what values cause the quadratic formula to produce complex numbers as the "roots".

Answer 3

public static void main(String[] args) throws Exception {
    Scanner sc = new Scanner(System.in);
    int a, b, c;
    int x1, x2, divisor, dividendo1, dividendo2, raiz, resta, cuadrado;
    System.out.println("Ingresa el valor de a: ");
    a = sc.nextInt();
    System.out.println("Ingresa el valor de b: ");
    b = sc.nextInt();
    System.out.println("Ingresa el valor de c: ");
    c = sc.nextInt();
    cuadrado = b * b;
    resta = cuadrado - 4 * a * c;
    raiz = (int)Math.sqrt(resta);
    if (raiz==0) {
        throw new ArithmeticException();
    }
    dividendo1 = -b - raiz;
    dividendo2 = -b + raiz;
    divisor = 2 * a;
    x1 = dividendo1 / divisor;
    x2 = dividendo2 / divisor;    
    System.out.println("x1: " + x1 + ", x2: " + x2);
    
}

}

I got it!