用Java求一元二次方程ax2＋bx＋c=0的根,要求a、b、c从控制台输入

import java.util.Scanner; public class Compare { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入a"); int a = sc.nextInt(); System.out.println("请输入b"); int b =