这道题简单，在OpenJudge上有一道更难的，网址 http://noi.openjudge.cn/ch0104/20/

打得有问题，求各位大神看一下 我打的代码：

#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
	double a,b,c;
	cin>>a>>b>>c;
	double x1,x2;
	cout<<fixed<<setprecision(5);
	if(b*b<4*a*b){
		x1=(-b/(2.0*a))+(sqrt(4.0*a*c-b*b)/(2.0*a));
		x2=(-b/(2.0*a))-(sqrt(4.0*a*c-b*b)/(2.0*a));
		printf("x1=%lf+%lfi;x2=%lf-%lfi",-b/(2.0*a),sqrt(4.0*a*c-b*b)/(2.0*a),-b/(2.0*a),(sqrt(4.0*a*c-b*b)/(2.0*a)));//cout<<"x1="<<x1<<"i;x2="<<x2;
		return 0;
	}
	if(b*b>4*a*c){
		x1=(-b+sqrt(b*b-4*a*c))/(2*a);
		x2=(-b-sqrt(b*b-4*a*c))/(2*a);
		printf("x1=%lf;x2=%lf",x1,x2);
		return 0;
	}
	if(b*b==4*a*c){
		printf("x1=x2=%lf",(-b+sqrt(b*b-4*a*c))/(2*a));
		return 0;
	}
	return 0;
}