问题 1484: [蓝桥杯][算法提高VIP]Quadratic Equation

#include <iostream>
#include <math.h>
#include <stdio.h>
using namespace std;

int main()
{
    double a,b,c;
    double x1,x2;
    double d;
    cin>>a>>b>>c;
    d = sqrt(pow(b,2)-4*a*c);
    x1 = (-b+d)/(2*a);
    x2 = (-b-d)/(2*a);
    if(d>0){
            if(x1>x2){
                 printf("%.2f %.2f",x1,x2);
            }
            else{
                printf("%.2f %.2f",x2,x1);
            }

    }else if(d == 0){
    printf("%.2f",x1);
    }else{
    printf(" ");
    }
    return 0;
}