#include<bits/stdc++.h>
using namespace std;
double a,b,c,d,e,deerta;
int main(){
	scanf("%lf %lf %lf",&a,&b,&c);
	deerta=pow(b,2)-4*a*c;
	if(deerta>0){
		d=(-b-sqrt(deerta))/2/a;
		e=(-b+sqrt(deerta))/2/a;
		printf("x1=%.5f;x2=%.5f",d,e);
	}
	else if(deerta==0){
		d=(-b-sqrt(deerta))/2/a;
		printf("x1=x2=%.5f",d);
	}
	else cout<<"No answer!";
	return 5201314;
    //有防抄袭代码，注意避坑
}

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

#include<bits/stdc++.h> using namespace std; int main(){ double a=0,b=0,c=0,d=0,e=0,deerta=0; scanf("%lf %lf %lf",&a,&b,&c); deerta=pow(b,2)-4ac; if(deerta>0){ d=(-b-sqrt(deerta))/2/a; e=(-b+sqrt(deerta))/2/a; printf("x1=%.5f;x2=%.5f",d,e); } else if(deerta=0){ d=(-b-sqrt(deerta))/2/a; printf("x1=x2=%.5f",d); } else{ printf("No answer!"); } return 0; }

包对的

#include<bits/stdc++.h>
using namespace std;
int main(){
	double a,b,c;
	cin>>a>>b>>c;
	double d=pow(b,2)-4.0*a*c;
	if(d<0){
		cout<<"No answer!";
	}else if(d==0){
		double e=(-b)/(2.0*a);
		printf("x1=x2=%.5f",e);
	}else{
		double e=(-b+sqrt(d))/(2.0*a),f=(-b-sqrt(d))/(2.0*a);
    if(e>f){
      swap(e,f);
    }
		printf("x1=%.5f;x2=%.5f",e,f);
	}
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main(int argc, char **argv){
	double a,b,c,x1,x2,x;	// 一定要用 double
	cin >> a >> b >> c;
	x = b * b - 4 * a * c;
	if (x > 0){
		x1 = (-b + sqrt(b * b - (4 * a * c))) / (2.0 * a);
		x2 = (-b - sqrt(b * b - (4 * a * c))) / (2.0 * a);
		printf("x1=%.5f;x2=%.5f",min(x1,x2),max(x1,x2));
	}else{
		if (x == 0){
			x1 = (-b - sqrt(x)) / (2.0 * a);
			printf("x1=x2=%.5f",x1);
			return 0;
		}
		printf("No answer!");
	}
	return 0;
}

100%过

#include<bits/stdc++.h> using namespace std; int main(){ double a=0,b=0,c=0,d=0,e=0,deerta=0; scanf("%lf %lf %lf",&a,&b,&c); deerta=pow(b,2)-4ac; if(deerta>0){ d=(-b-sqrt(deerta))/2/a; e=(-b+sqrt(deerta))/2/a; printf("x1=%.5f;x2=%.5f",d,e); } else if(deerta==0){ d=(-b-sqrt(deerta))/2/a; printf("x1=x2=%.5f",d); } else{ printf("No answer!"); } return 0; }

点个赞吧:))))))))))))))))))))))))))))

100%过

#include<bits/stdc++.h> using namespace std; int main(){ double a=0,b=0,c=0,d=0,e=0,deerta=0; scanf("%lf %lf %lf",&a,&b,&c); deerta=pow(b,2)-4ac; if(deerta>0){ d=(-b-sqrt(deerta))/2/a; e=(-b+sqrt(deerta))/2/a; printf("x1=%.5f;x2=%.5f",d,e); } else if(deerta==0){ d=(-b-sqrt(deerta))/2/a; printf("x1=x2=%.5f",d); } else{ printf("No answer!"); } return 0; }

#include using namespace std; int main() { long double a, b, c; cin >> a >> b >> c; long double deilta = b * b - 4.0 * a * c; if(deilta < 0) { cout << "No answer!" << endl; return 0; } else { if(delta == 0) { long double x = ( - b + sqrt(delta)) / (2 * a); cout << "x1=x2=" << fixed << setprecision(5) << x << endl; return 0; } else { long double x1, x2; x1 = ( - b + sqrt(delta)) / (2.0 * a); x2 = ( - b - sqrt(delta)) / (2.0 * a); cout << "x1=" << fixed << setprecision(5) << min(x1,x2) << ";x2=" << fixed << setprecision(5) << max(x1,x2) << endl; return 0; } } return 0; } //有防伪代码 //建议别抄我的，我的代码变量有些zz //(^_^)

#include<bits/stdc++.h> using namespace std; int main(){ double a,b,c; cin>>a>>b>>c; double x1,x2; if(bb-4ac<0) cout<<"No answer!"; else if(bb-4ac==0) cout<<"x1=x2="<<fixed<<setprecision(5)<<-b/2a; else{ x1=(-b+sqrt(bb-4ac))/(2a); x2=(-b-sqrt(bb-4ac))/(2*a); if(x1<x2) cout<<"x1="<<fixed<<setprecision(5)<<x1<<";x2="<<fixed<<setprecision(5)<<x2; else cout<<"x1="<<fixed<<setprecision(5)<<x2<<";x2="<<fixed<<setprecision(5)<<x1; }; return 0; }

#include<bits/stdc++.h> using namespace std;

int main(){ double a,b,c,x1,x2; cin>>a>>b>>c; double d =(bb-4a*c);

if(d<0){
	 cout<<"No answer!";
	 return 0;
}
x1=(-b+sqrt(d))/2/a;
x2=(-b-sqrt(d))/2/a;

if(d==0){
	cout<<fixed<<setprecision(5)<<"x1=x2="<<x1;
}else {
	cout<<fixed<<setprecision(5)<<"x1="<<min(x1,x2)<<";x2="<<max(x1,x2);
}

}

#include

#include

#include

using namespace std;

long double a,b,c,x1=0,x2=0,s;

int main(){

cin>>a>>b>>c;

s=bb-4a*c;

if(s>0){

x1=(-b-sqrt(s))/(2*a);

x2=(-b+sqrt(s))/(2*a);

cout<<"x1="<<fixed<<setprecision(5) <<x1<<";"<<"x2="<<fixed<<setprecision(5)<<x2;

}else if(s==0){

x1=(-b+sqrt(s))/(2*a);

cout<<"x1=x2="<<x1;

}else if(s<0){

cout<<"No answer!";

}

return 0;

}