CS106A assignment2 --problem1 QuadraticFormula

/* TODO: A program that the roots of the quadratic equation
/
import acm.program.;

public class QuadraticFormula extends ConsoleProgram {
    public int a,b,c;
    public double discriminant;
    public double root1,root2;
    public void run() {
        getNumber();
        getRoots();
    }

    private void getNumber() {
        println("This program needs three intengers:");
        a = readInt("Enter first int a:");
        b = readInt("Enter second int b:");
        c = readInt("Enter third int c:");
    }

    private void getRoots() {
        getDiscriminant();
        showRoots();
    }

    private double getDiscriminant() {
        discriminant = b*b - 4*a*c;
        return discriminant;
    }

    private void showRoots() {
        if(discriminant < 0){
            println("There are no real roots");
        }else if(discriminant ==0 ){
            root1 = (-b)/(2*a);
            println("there is one root:"+ root1);
        }else {
            root1 = (-b+ Math.sqrt(discriminant))/(2*a);
            root2 = (-b- Math.sqrt(discriminant))/(2*a);
            println("one root is:"+root1);
            println("another root is:"+root2);
        }
    }
}