C语言考试练习题_一元二次方程-题解（Java代码）

解题思路:

注意事项:
正负两个根

参考代码:

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

int a = scanner.nextInt();

int b = scanner.nextInt();

int c = scanner.nextInt();

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

double x1 = (-b + Math.sqrt(delta)) / 2 * a;// sqrt求平方根

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

System.out.println(String.format("%.2f", x1) + " "+ String.format("%.2f", x2));//输出保留两位小数

}

}