信息学奥赛一本通oj

题目链接

WA了一个点

下面是代码

#include<iostream>
#include<cstdio>
#include<cmath>
#include<iomanip>
using namespace std;
int main(){
	cout<<setprecision(5)<<fixed; 
	double a,b,c;
	double x1,x2;
	double d;
	cin>>a>>b>>c;
	d=b*b-4*a*c;
	if(d<0){
		cout<<"No answer!";
		return 0;
	}
	if(d==0){
		x2=x1=((0-b)+sqrt(d))/(2*a);
		cout<<"x1=x2="<<x1;
	}else{
	    x1=((0-b)+sqrt(d))/(2*a);
		x2=((0-b)-sqrt(d))/(2*a);
		if(x1<x2){
			cout<<"x1="<<x1<<";"<<"x2="<<x2;
		}else{
			cout<<"x1="<<x2<<";"<<"x2="<<x1;
		}
	}
	return 0;
}