Question

用JAVA编程求一元二次方程的根，一元二次方程的系数从键盘输入

请把程序代码及运行结果截图发过来

Answer 1

import java.util.Scanner;

public class Demo

{

public static void main(String [] args){

Scanner sc = new Scanner(System.in);

System.out.println("输入2次方的系数");

int a = sc.nextInt();

System.out.println("输入1次方的系数");

int b = sc.nextInt();

System.out.println("输入0次方的系数");

int c = sc.nextInt();

double x1 = (-b + Math.sqrt(b*b - 4*a*c))/2*a;

double x2 = (-b - Math.sqrt(b*b - 4*a*c))/2*a;

System.out.println("根分别是 " + x1 + "," + x2);

}

}