Java Conditional Statement Exercises: Solve quadratic equations

Java Conditional Statement: Exercise-2 with Solution

Write a Java program to solve quadratic equations (use if, else if and else).

Test Data
Input a: 1
Input b: 5
Input c: 1

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise2 {

    
  public static void main(String[] Strings) {

        Scanner input = new Scanner(System.in);

            System.out.print("Input a: ");
            double a = input.nextDouble();
            System.out.print("Input b: ");
            double b = input.nextDouble();
            System.out.print("Input c: ");
            double c = input.nextDouble();

            double result = b * b - 4.0 * a * c;

            if (result > 0.0) {
                double r1 = (-b + Math.pow(result, 0.5)) / (2.0 * a);
                double r2 = (-b - Math.pow(result, 0.5)) / (2.0 * a);
                System.out.println("The roots are " + r1 + " and " + r2);
            } else if (result == 0.0) {
                double r1 = -b / (2.0 * a);
                System.out.println("The root is " + r1);
            } else {
                System.out.println("The equation has no real roots.");
            }

    }
}

Sample Output:

Input a: 1                                                                                                    
Input b: 5                                                                                                    
Input c: 2                                                                                                    
The roots are -0.4384471871911697 and -4.561552812808831

Flowchart:

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a Java program to get a number from the user and print whether it is positive or negative.
Next: Write a Java program to to find the largest of three numbers.