一元二次方程根

package test;
import java.util.Scanner;
import java.math.*;
public class test {
	public static void main(String[] args){
		Scanner input=new Scanner(System.in);
		System.out.println("输入啊a,b,c;");
		double a,b,c;
		a=input.nextDouble();
		b=input.nextDouble();
		c=input.nextDouble();
		if(b*b<4*a*c)
		{
			System.out.println("无实数根");
			
		}
		if(b*b==4*a*c)
		{
			double r=-b/2*a;
			System.out.println("该方程的实数根为"+r);
		}
		if(b*b>4*a*c)
		{ 
			double x=b*b-4*a*c;
			double r1=(-b+Math.pow(x, 0.5))/(2*a);
			double r2=(-b-Math.pow(x, 0.5))/(2*a);
			System.out.println("该方程的实数根为"+r1 + r2);
		}

	}
}		
package test;
import java.util.Scanner;
import