求一元二次方程的解

#include<iostream.h>
void main()
{
int a,b,c;
cout<<"请输入一元二次方程各个系数a,b,c"<<endl;
cin>>a>>b>>c;
if(b*b-4*a*c==0)
cout<<"其解只有一个数即"<<-b/(2*a)<<endl;//
else if(b*b-4*a*c<0)
cout<<"此方程无解"<<endl;
else
cout<<"其解有两个数分别为"<<(-b+sqrt(b*b-4*a*c))/(2*a)<<(-b-sqrt(b*b-4*a*c))/(2*a)<<endl;
}