java编写一元二次方程

以下是 Java 代码，用于解一元二次方程：

import java.util.Scanner;

public class QuadraticEquationSolver {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the value of a: ");
        double a = scanner.nextDouble();
        System.out.print("Enter the value of b: ");
        double b = scanner.nextDouble();
        System.out.print("Enter the value of c: ");
        double c = scanner.nextDouble();

        double discriminant = b * b - 4 * a * c;

        if (discriminant > 0) {
            double root1 = (-b + Math.sqrt(discriminant)) / (2 * a);
            double root2 = (-b - Math.sqrt(discriminant)) / (2 * a);
            System.out.println("The roots are " + root1 + " and " + root2);
        } else if (discriminant == 0) {
            double root = -b / (2 * a);
            System.out.println("The root is " + root);
        } else {
            System.out.println("The equation has no real roots");
        }
    }
}

使用这个代码，你可以输入一元二次方程的系数，然后程序将计算并输出方程的根。