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);
}
}
}
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