Quadratic_Equation.java, Java

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import java.util.Scanner;
public class Quadratic_Equation
{
    public static void main(String[] args) 
      {
        int a, b, c;
        double root1, root2, d;
        Scanner s = new Scanner(System.in);
        System.out.println("Given quadratic equation:ax^2 + bx + c");
        System.out.print("Enter a:");
        a = s.nextInt();
        System.out.print("Enter b:");
        b = s.nextInt();
        System.out.print("Enter c:");
        c = s.nextInt();
        System.out.println("Given quadratic equation:"+a+"x^2 + "+b+"x + "+c);
        d = b * b - 4 * a * c;
        if(d > 0)
        {
            System.out.println("Roots are real and unequal");
            root1 = ( - b + Math.sqrt(d))/(2*a);
            root2 = (-b - Math.sqrt(d))/(2*a);
            System.out.println("First root is:"+root1);
            System.out.println("Second root is:"+root2);
        }
        else if(d == 0)
        {
            System.out.println("Roots are real and equal");
            root1 = (-b+Math.sqrt(d))/(2*a);
            System.out.println("Root:"+root1);
        }
        else
        {
            System.out.println("Roots are imaginary");
        }
    }
}

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Compilation time: 0.93 sec, absolute service time: 0,98 sec